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Please don't take this as aggressive, but there seems to be multiple red flags in what you're saying! I am not a professional by any means but I have a few concerns. Sorry for the incoming wall of text btw!!

1. You live with your parents and are a legal minor. Do NOT bring any animals under the roof of your parents that they are not comfortable with. I'm assuming you are in school and planning to go to college. What are you going to do with a venomous snake when you're living in a dorm?
   
2. If you don't "have a whole lot of money", why do you want to bring another animal under your care if you might not be able to care for it? Yet another reason to wait until you are out of school and in a VERY stable place in life before taking on a dangerous animal. Thinking ahead will ensure the best for you both!
   
3. If you only have two mild mannered snakes, I wouldn't take in an advanced species until you have more experience under your belt with something that's more difficult to care for. Going from boa constrictor to even a quick tempered/defensive animal (yes even a 'training' snake) is a big jump... care requirements, ease of acquirement, and otherwise. Maybe find an animal with a more 'intermediate' temperament and care requirements, but in the meantime, enjoy the snakes you have and don't take them on too fast. Take baby steps! You have lots of time to enjoy these creatures and learn from them.
   
4. What will you do if a venomous species gets sick? Are you living in an area with a vet that will care for them? Do venomous species comply with local legislation?
   
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   You already seem to have the idea of treating what you get like the most venomous thing you will ever meet, which would be good practice. The best thing I can tell you is to interact with mangroves or falsies in person any way you can; perhaps locating a nearby herpetarium, keeper, or zoo that will allow you to volunteer. Go to reptile shows and try to find the species you're looking for and ask if you can handle them. Go to reptile forums and read, read, read, read, ask for the personal experiences of people who own these snakes.
   
   If you're wanting vipers, I suggest a blood python. They pack the heavy body, the temperament (aka very fast swings in mood where you have to be very careful with interaction and become very in tune with their behavior), and the speed and musculature of a Gaboon while lacking the venom.
   
   Instead of a falsie or a mangrove, a carpet python might also be a good choice. Some localities do not grow as large as others (darwins, IJs are the smaller ones while jungles are intermediate size) and they are fast, energetic, and snappy. Never met a calm carpet in my life, lol, but they're worth it.
   
   Hognoses might also be a good choice. They're small, but they are mildly venomous (about bee sting worth) and colubrids like the species you're looking at. They may be difficult to get to start feeding, and that challenge is something you might encounter with a falsie or a mangrove, but they tend to be reluctant to bite and are good handlers.
   
   Certain species of rat snakes and racers are a good introduction into more flighty, nervous, and bitey snakes as often they tend to be feisty and fast. Remember that some species are much more difficult to care for than others, however. North American rat snakes come in many morphs and localities to choose from and some very much will have temperaments found in gateway hots. Cave racers would be a great choice of an intermediate species in my opinion.
   
   (Of course, my evaluations of temperament are based on generalization and personal experience. You may pick up a blood or a carpet that's the sweetest thing on the planet, or a hoggie that will bite you every chance it gets.)
   
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   Don't go for cheap when it comes to caging and equipment. The bigger investment will be worth it in the long run; get a good hook, good tongs, good locking enclosure and make sure you know how to properly operate everything BEFORE using it on any snake, venomous or not. Different brands are good for different species, and different snakes will need different techniques to be mastered depending on temperament and size. Also remember there's more than hooking involved: bagging, tubing, etc.
   
   Always go for quality and captive bred status over cheapness and ready availability. Wild caught animals will have parasites and carry sickness and often refuse to eat, not to mention the taking of wild animals from their habitats is highly detrimental. The vet bills and the stress for a beginning keeper are definitely not worth the possible cheapness of the animal.
   
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   If I'm saying stuff you already know, I apologize! I just want the best for you and your future herps. Remember the level of responsibility that comes with a venomous species; if something happens to you, it reflects on the community as a whole.
   
   Here's some care sheets and useful links for you, in case you haven't already read them:
   http://www.reptilesmagazine.com/Snake-Species/False-Water-Cobra/ http://www.reptilesmagazine.com/Snake-Species/Mangrove-Snake/
   
   http://cobras.org/handling-snakes-golden-rules/
   http://www.reptilesmagazine.com/Venomous-Snakes/Laws-Regulations/
   http://www.venomousreptiles.org/
   
   https://www.amazon.com/Beginners-Guide-Keeping-Venomous-Snakes/dp/1934941174/161-9206310-4665712?ie=UTF8&redirect=true&tag=wetboy-20