Any snake experience is helpful. Even if you start with a corn... Everyone has to start somewhere.
My question for you is; Is it your goal to raise a burmese someday? Burms are considered 'high-maintenance' for their large size, eating requirements and space needed to keep them. You also have to keep up certain humidity levels, and basking temps.
My guess is that a Blood will help you learn how to care for snakes in general, and someday you'll be ready for a larger species like a burm, and that's going to be a new experience.
By then, you'll already know how to care for and deal with smaller species so taking care of a burm is basically the same (with a few species-specific details) on a much larger scale.
Take your time and get a lot of practice with different species, large and small, before you decide a large constrictor is for you. They are a huge commitment (no pun intended). Hope my ramblings helped!! =)
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~*SaMbA*~
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