How to train my 2 year old doberman?

I have a doberman thats almost 2 years old. I adopted him in December. The problem is when I walk him he always wants to run but I am unable to run. When I put him outside he would jump scatching my windows. I mean he's very gentle and doesn't bite but this is becoming a bit of a problem. Any tips on how I can control this? Also, is he too old for obedience classes?