Sit down, buckle up and hang onto your hat. Your in for a ride...lol
Hopefully you have someone at your location (Parts manager or another parts associate) that's going to take you under their wing and show the ropes. Always stay positive, truthful and ask a lot of questions. Be prepared to learn something new every day. If you are with an OEM they will also be a wealth of help & information.
Hang in there and good luck