Getting into the gun culture is actually very easy once you start getting trained to use a gun. You'll start meeting people and before you know it, you're in the club.
Call up your local Sheriff's department or Police Department and ask them about the required gun courses. They will probably be able to point you to locations to sign up for the courses as well. Here in Cheyenne, WY the local community college teaches a handgun safety course that is required before getting a CCP. The PD gave us the name and number to contact.
Before you go through the course I would really recommend going shooting with someone that you are comfortable with. If you don't know anyone like that I would suggest waiting until you go through the course. With the knowledge and confidence you will gaing going through the course you will be able to buy a gun and get to know different people at the local gun shops.
Hopefully some members from Oregon will answer your question about specific instructors or organizations to get training from.
-Benjamin N. Hare