You don't really need to do anything for the moment, the 5x5 by itself will be fine. Its the core lifts you need to focus on. Also don't worry about the extra inches round the waist, you got muscles there too and they get worked with all the squats and deadlifts. Remember to feed the program bro, like Colombo said, bump up that protein intake to 300g+ as you grow you'll need to increase cal intake to fuel and repair etc. I really found eating the harder part, until I found out what best to eat.