Study for and take the AFOQT and TBAS ASAP. You can retake the AFOQT after 1 year so you want to get your first one done as soon as you feel ready. You have a lot more hours than me so your PCSM (combined AFOQT and TBAS) score should come out to be pretty good. Either contact the ANG wing about this or a local AFROTC detachment. I did mine both at the AFROTC detachment at my college and they were very helpful.
If you want PRK/LASIK, try to get that done soon too. I had mine done in May and I have to wait 6 months to apply to make sure the surgery went okay. Also check the medical section on the forum to find out the details to see if you even need it. If you are 20/30 and 20/40 without the glasses on, you don't. If you do need it, make sure you get the appropriate form and go over it with your doctor so that everything is documented before/during/after the surgery.
I don't know about enlisting before trying to apply to a UPT board. Really depends on the specific ANG wing. Some wings only hire from within. Try getting in contact with other wings with airframes/locations you are interested in and seeing if you can visit. You can then decide where you feel you would like it/fit best and if it would be worth it for you to enlist to try to increase your chances.