I was a 19E/K-10 (armor crewman), did OSUT at Ft. Knox, then went to 1st Cav Ft. Hood and finished up with the 3/163rd ACAV (TXARNG). Just as you are doing, I went in as an E3 ... had no interest in OCS, got out as an E7.
In exchange for 6 years (4 active, 2 NG) the Army paid off all my college student loans, gave me some cash and if I ever decide to go back to college, that would be paid for also. There were many different enlistment programs with various incentives. Don't hesitate to ask about all of them. Take your time picking an MOS based on your test scores. If you can choose one which crosses over into civilian life thats a good idea too ... even though I didn't, I don't regret my choice.
Also :
When you have to sign a receipt for any equipment issue make sure and draw a line at your signature and write " nothing follows ". Supply guys are notoriously sneaky, try to make friends with them in your unit if you can ... verify every item you sign for.
Buy a decent but not too expensive pair of running shoes and break them in a little bit before you leave for basic training.
Motorpool NCO's take it personally when you break stuff, doesnt matter if its your fault or not.
Good Luck !