If you intend on doing all of that, Id suggest that you Milk venomous as a hobby or a career. That field is only going to grow, as far as boas and pythons, you will have to know each species and be able to tell them apart on sight, my suggestion pick ONE SNAKE out of the group you pick, THey have a lot of people working on the anaconda (Jesús Rivas) alone and they find out new information everyday. Aso if you want to be in the field your going to want to live in Africa, or Australia/Indonesia/etc. those areas are the most populated for Pythons as im assuming you know. Theres just too much to learn to try and do them all as a field herp, Unless you just want to know general which isn't too much a use for anyone anymore (Almost anyone into a snake can write a care sheet for you, IF its well written with many details or poorly written with generals its still a care sheet).
Also always remember that not too many people are full time herpers, they have other jobs that fuel the herping they do. Many big herpers are the pioneers of this industry, Bob Clark, Ralph Davis, Kevin M, THey are able to do this because of the mass volume they produce and the new genes they come across.
Get your masters in Bio theres a lot more possibilites. Gene Therapy, understanding genes, Understanding the venom, what the venom is made out of, etc. A lot more possibilites then just being a strict herpetologist. Also, There's no money in being a herpetologist, Im not saying don't do it im just saying no one except other herpers care if the snakes colors are to hypnotize other animals or for camoflauge. If you truely care about the animals then its a very good choice, just don't expect anything except being able to be around the animals. You go to school and you get your masters in Herp, and it costs you $30,000 just for school, then you get the job some where and you get paid $25,000 a year, its just not effective to do that.
Being a herper isn't just a realisitc future, but milking the snakes for there venom is. As we come into contact with these snake more and more we have more bites.
SOrry if this has crushed your dream but hopefully it has shown you a new different way to go about doing what you want to do.
Here are some links to site that may show you things i haven't.
http://www.ukans.edu/~ssar/career.html
http://www.asih.org/pubs/herpjobs.htm
http://www.ku.edu/~ssar/careerfaq.html
Also these people would be a great help Id like to think anyway
Henri C. Seibert (Chairman)
Department of Zoological and
Biomedical Sciences
Ohio University
Athens, Ohio 45701, USA
Ralph W. Axtell (SSAR Pres., 1983)
Department of Biological Sciences
Southern Illinois University
Edwardsville, Illinois 62026, USA
Neil B. Ford
Department of Biology
University of Texas
Tyler, Texas 75701, USA
Martin J. Rosenberg
Department of Biology
Case Western Reserve University
Cleveland, Ohio 44106, USA
Good luck with the choice you make, this is your future make your decision carefully.
Pat