How easy would it for me to get back into the Navy?

I was in the navy for 30 months until i got an administrative discharge wich is honorable. And if i was to go back in would i have to go thru a refresher course or go back to boot camp. I was discharged in August of 2008. I would have to drop a few more lbs and i do have one dui that I recieved in Dec 2008. I would thank your for any information.