You have more than 30days of leave saved up?
March3 is the "last possible day to report" date, I'm sure you'll actually travel there sooner, if you graduate Jan26.
More than anything, keep your military bearing, listen to instructions, ask questions, be friendly. Actually if you've been at Gordon more than 3 weeks you need to practice your military bearing asap cuz I'm sure you lost some there.
You might or might not get a job you like when you arrive. EVERYTHING will be different than you expect. Don't fall in with the bad crowd when you get there. You'll know who I mean- the ones who grumble about the unit, their supervisor, the post, the Army. They've been a SPC FOREVER and are fun to hang out with but will never be promoted because they're always getting into trouble.
Trust your supervisor and fellow Soldiers- they were all the 'new guy' back in the day. If they don't help you enough ask others in the unit. You will see your 1SG and Commander more, you can go to them if you've asked everyone else for assistance. (But of course your supervisor and PLT SGT will be upset if you don't let them help you first.)
DO PT. You WILL have a PT test shortly after arriving.
More than anything- have fun! Enjoy the change and relax. The Army won't let you fail.