New to Audi and the Forum

Hello all, my name is Reggie and I am the proud owner of a 2000 A4 1.8 Quattro in automatic. She has 154,000 miles on her paid $3,500. I use to be a long time BMW fan but since I got a job working at an Audi dealership, I've kinda converted over. These are some really nice care. I'm not sure what rims are on her but they are not factory (18's). Any pointers on what to look out for on these cars will be appreciated. Thanks