Glad to hear how dedicated you are. You are not alone when feeling like its hard to get a personalized workout. I started a small basketball website company and we design personalized off season regimes for young players.We are small and are working with a lot of players right now but would be happy to work with you to give you the proper structure, guidance and innovative drills you need.
Shoot me an email: firstname.lastname@example.org and we'll start to dialogue about your summer program. I look forward to working with you.
Founder of the worlds first ever online basketball camp, 3-Point Academy
Our home website; Innovative Athletes
iHoops just recently launched a strength and conditioning section that's full of offseason workouts that work on your strength, quickness and basketball skills.
An example of one workout that's good for your quickness is easy enough--just get a ball and some tape and do some line drills outlined here:
There's also a 6-week offseason workout program designed specifically for guards, typically high-school aged players:
It's good to see you're dedicated. You are taking the first big step to being a great basketball player.