1. Study free materials available online.
2. Take free practice tests.
3. Look for license exams in your area, or take an online one. Exam fees in my experience have been ~$25 and go towards whichever club is proctoring.
4. Pay the $35 FCC licensing fee and get your callsign.

Theoretically, that’s all you need. It’s possible to use certain internet linked amateur transmitters for no cost as long as you have a valid callsign. However, I promise it’s a lot more fun with a real transceiver. You can buy a bare minimum, highly hackable handheld VHF/UHF transceiver for as little as $20.

Or you can slowly give your soul to the moneypit of HF equipment…