Welcome
Our Forum is great for answers and getting vendor recommendations.
Alan didn't mention it but a subscription to O-Gauge Magazine will introduce you to many places to spend your money. I have to 2 local stores which are 3,000 and 1,700 miles away from my house. Nothing very nears to me unfortunately.
The wisdom on this forum and people who are willing to help has kept me from getting overly frustrated with my lack of knowledge in most areas of this hobby.