15 year old highschool student looking to start crypto and eth mining.

There's Binance, Paxful, and Forex. I've got experience with the first two and must say that they're both reliable. If you want to mine yourself then you'd have to buy rigs or ASIC miners to do the job, they may break the bank but if you invest wisely, it won't be that much of a risk, prepare to see a spike on your electrical bills though.