When I can do 3 X 12 ill raise the weight and start over.
Good place to start. Eventually you might need to lower those rep ceilings for certain lifts, especially if you start to see rapid progress.
My only advice is to listen your body and each lift, and gradually lower that rep ceiling over time as you see fit. As you approach a 200 bench and 300 squat, hitting 12 reps per set is going to become increasingly more intense, and perhaps might actually slow progress.
I spent a lot of time in the 200s on bench and 300s on squats fighting for reps. It can be done, but some 3-5 rep work might be as beneficial at some point for pure end limit strength.
In August I want to focus on strength again. I don't know exactly how to go from here. Stick to strength or do a strength/ mass periodization?
You want to ride progression similar to what you described in the 5 to 10 rep range and climb that strength ladder as quickly as possible. Strength and mass gains will go hand in hand for you. You need to build both right now, and build a base.
Spend a year or two doing that, and learning your body. Depending on the rate of your progress, you can then make programming adjustments.
Projecting too far ahead won't benefit you right now because there are too many variables. My advice is to pick a program you like, and set out like a rabid dog in heat after a 300 bench, 400 squat and 500 deadlift.
While on that path read every article you can on form, and post videos so people can help you. We will do everything in our power to help you climb that ladder as quickly and safely as possible.
I hope this helps some.