I won't have a routine (Not sure what you mean here - that you don't have a routine or you don't want to have a routine?  You could say "I don't have a routine" or "I never have a routine") Either way, you should have the article "a" between have and routine.

I usually wake up at eight and then I have breakfast and take a shower. and I sometimes practice basketball with one a friend or we just run at ten or eleven, but sometimes I can't because I have work to do. After that, I usually have lunch mostly at two in the afternoon, and then I leave home at forty past two and I study at university between four to eight.  Finally I come back home, arriving at ten or ten thirty.