I have not found a clear source on how much to buy in with when hitting the casino. Here's my situation:

Just starting out, so $8000 BR
1 to 4 bet spread (10, 20, 40, 80)

Small town with one casino, so the plan is only once a week on differing shifts, and not staying for more than 1-2 hours.

First of all, is this situation looking good to start out with?

Second, how do I determine how much to buy in for during each visit?

Any advice is appreciated!