Thetahoescout is right on here
A lot of your counting practice can be done at home where it does not cost you any money. Even if you're "just practicing" at a real table, there is still a risk. However, the only way to simulate real casino conditions (ie: annoying players, heat, bells and whistles, waitresses, etc....) is to play in a casino. I agree with the suggestion to play BS, but keep count in your head and think to yourself what you would do in such and such a situation. If there are some tough calls you can always make the "informed decision" to use your indicies (if that's part of your game) There is a lot of great software out there (all Casino Verite/QFIT are paid), and some of it free (resources on the web and for download) that are of great benefit. As for your spread, larger spreads typically yield a greater profit but this may not be practical considering your BR and RoR you're willing to accept. There is software out there, I don't remember which, that will calculate an optimal bet spread for you. Some common spreads are 1-4, 1-12, and 1-16 units.