Congratulations! I have alot of respect for anyone trying to make a profit on a bait and tackle store. I fish the Kalama River alot so I'll do my best to help you out.

Here's few things to have on hand that could make your place a success:

fresh bait
hot coffee
good (timely) information
advice on what's hitting and where
drop-off service for drift boaters
a bragin' fish bulletin board
knowledge of the river and the fish(that'll come with time)

Personal opinion - it probably wouldn't hurt to establish a cooperative relationship with Pritchard's. They're a good outfit too. Everyone wins when cooperation results in better fishing for the anglers.

Best of luck!