5x5 routines are great for non advanced lifters. The thing that stalls people's progress a lot of the time is they don't EAT. You want to make big gains with this? You'll need to give your body the building blocks it needs to do so. I used to help do some training and coaching for lifters and fighters, easiest start was 2 extra shakes a day with oats and protein (extra 800 cal or so). It'll also help your recovery a ton.