don't you ever speak poorly of let it ride again
for your question about getting chips, just sit down at a table and put your money on it. dealer will turn it into chips. you can ask them to break it down into whatever chips you want, for the amount you said probably 5 dollar chips. since you're going Monday-Wednesday there should be plenty of 5 dollar minimum tables during the day, and should find 10 dollar tables at night.
also avoid the first seat at a blackjack table if you don't know what you're doing, because then you also fuck up everyone's hand. next to last seat or third from last should be ok. if you have any questions speak up, people will gladly give advice