Don't be afraid, be excited! Go to a few different meetings and in a short time you'll see the people who come early and stay late and attend the meetings you do. Find one of those folks who have some decent sober time and have worked the steps, or are at least on step 9 (that one seems to always take everyone awhile to complete). Ask one of them if they would be wiling to be your temporary sponsor and show you the ropes. Believe me, you will be helping them much more than they will be helping you!
Also don't worry about being particular. Your best thinking got you in the place you are in today so maybe it's best to let someone else do some thinking for you and you just need to follow their guidance for awhile. Find an active sponsorship line and you will be fine if you follow their advice. Also, this isn't like you only get one chance to pick someone. If you find that you don't get along with a sponsor you simply thank them for helping you but that you are going to try another sponsorship line. It happens all the time.
You will also find that you will try to seek out a person who is buddy buddy with you but you really don't want that. You NEED someone who is friendly but will call you out on your BS and won't put up with your crap. Trust me, that person will save your life and not the person who agrees with you and just wants to be your buddy.