Patella Dislocation. Knee brace to buy?

1 week ago , on Gym Class we were playing football. Someone hit my knee from the side and it dislocated. My teacher popped it back in place , she reacted quickly. I'm scared that I won't be able to play sports , lift heavy objects or run without being scared of dislocating it again. I don't have any bone fractures , I have a some fluid in the kneecap area but it's gonna be fine. They gave me Serra+ pills for my situation ( I guess for pain relief) . Doctors then said It was just a patella dislocation and nothing else , no fractures. I need advice for the recovery. How long will the recovery be for my injury? What should I avoid doing ? How long will I not be able to do sports (Football,Basketball and running) ? What's the best budget-friendly knee brace to buy ? I'm really young and I'm scared I'm gonna get Overweight.. And anything else you have to recommend me . Thank you , Doc ! :)