Whoever the PIC is on these flights (and geez I hope it's a CFI) would probably be happy to answer these questions for you... seems odd that you don't know some of this stuff already.
-You need at least a third class medical certificate to
solo.
And of course to obtain or hold a PP that medical cert must be current and valid (renewed every 3 years until age 40, then it's every 2 years).
This consists of a FAA-approved doctor confirming you are alive and can see, hear, and move your limbs.

They also test your urine for diabetes (not drugs), and look for anything weird involving your heartbeat, etc.
Mostly they rely on you to be thorough and honest on the questionnaire...
do not lie or hide anything on the questionnaire!If you don't know what shots you've had or what hospital visits you've had, ask your parents.
-You can solo a light single in the US, with a signoff from your instructor, on or after your 16th birthday.
- You can take the PP check ride on or after your 17th birthday.
-A radio license is only required if you fly the aircraft outside the US...I'm not sure how that is obtained.
This leads to my next point: all of this info is contained in the FAR/AIM, a book I suggest you start studying
now.
I can't overstate the importance of thinking and planning ahead with this... by the time most students are halfway through their PP training, they become completely overwhelmed unless they started out with good study habits.
It's hundreds of pages of stuff you need to know, not just to pass the tests, but to be safe and not jeopardize your hard-earned ticket by busting regs.
Why wait when you can get an edge by reading it now?
You don't want to end up like me: having to reach for that book every time a kid asks you a question on the Internet, now do you?

Good luck!
