Hello Impulze nice to meet you,
If you only want to gain girth, follow the newbie routine but drop the stretches for 2 months. After the first two months you can add the squeezes and jelq at higher erection levels. Try to jelq with you penis angled up to the ceiling and initially go for around a 60% erection to minimise chances of length gains.
You might also investigate pumping. Check out the pumpers forum for suggested girth options (normally a bigger tube).
Any program you try will most likely include jelqing.
Are you sure you don’t want to gain length? If you do (or don’t mind) then follow the newbie program as written for 2 months.
Hope that helps.