Like many guys have told you already, worrying about getting “too big” is like worrying about getting “too rich”. It doesn’t happen overnight, so you can and should aim for it from the start, not hamstring yourself by intentionally aiming low. You’re not even 190 pounds. Don’t worry about how to avoid being 260 pounds. Worry about how to get to 195 pounds, and then 205.
As for details, I stand by everything I recommended when you asked how to train last month.
I’ve said it before, but if I had a dollar every time someone said “I don’t need to train legs much because I already have great legs”, I’d have a whole bunch of dollars.