The piece of advice would be to be careful with the weightlifting. My son injured his shoulder prior to his junior year of HS and missed the whole season. Biggest issue is that it was his throwing shoulder, we suspect he hurt it during off season HS weight session. He was getting a bit of interest before that mostly due to his Pop times and he could swing it a little.
I am using a lifting program I got from a CC that I went and visited. Some one from my high school went there and played baseball and he followed their lifting routine and he got very big.