B&M Newbie Chip/Betting Question

[JolsonFan]

Hi,
I'm travelling to the Sahara Casino and also Pahrump, NV in July and haven't played a live game in years (Foxwoods 1995 was last). I don't recall much of anything as how the chips and betting goes live. Assume I play at a 2/4 limit table. Where do I buy chips, at the table or at a cashier? In what denominations are the chips? How do I rebuy if I need to? Thanks. Paul.