Hi and welcome arcadies. If you want a boid I would reccommend a redtial boa or a small python. I have heard of many situations where people get burmese pythons for their first snake. These animals grow to be huge 6 meter snakes and end up being palmed off to dodgy homes when the owner discovers that this is not what he wanted. It is unfair on the animal, unless you are fully prepared to commit yourself to that kind of responsibility. The first small python that comes to mind is a ball python (royal python).
I would not go for something expensive yet at this stage because they tend to be more sensitive to their environment. Once you are sure of your ability to keep boids successfully then go wild, there are many wonderful animals out there.
Look out for babies and grow with them, you will learn alot more. When you find something you want to buy, insist on seeing it feed, even twice. Ask to see the seller's setup and the general condition of their animals. You don't want to buy an animal from dodgy conditions as they are more susceptable to health problems and this could put you off a great hobby.
If you have any questions, feel free to ask