This process worked for me:
1. check out: Aviation Jobs Portal - Guard and Reserve Job Listings - Free Job Search Online
2. Find a unit that is near where you want to settle down(They want guys to be living local)
3. Give them a call and setup a visit during as many drill weekends as you can...to maximize your opportunity to meet as many as possible, this lets them get to know you and you want to see if it is something you want to be a part of.
4. Get all your required paperwork submitted to their hiring POC(probably the one you talked to while setting up a drill wknd visit), resume, cover letter, flight records, etc
5. Continue to visit until asked to come back for an interview(for out of cycle hiring boards) or visit as much as possible before their pre-determined interview weekend. From my experience over the past 2 years, most units have a hiring board once a year. A few hire whenever, as needed.
6. Don't get discouraged if you don't make it after your first interview, have a few units in mind in case the timing doesn't work with your first choice.

Good Luck!