This visa allows you to study in the country and work to finance your expenses, but it requires a certain level of English and good ethical conduct. If you do not speak English or do not have good behavior, you will not have your visa granted.
You can obtain an F-M visa if you receive admission to study at a college or university that is accredited by the United States Department of Education (USDE). The requirements vary between educational institutions and some only require proof of basic level of English while others require that they speak English without problems before admitting students.
It also requires good ethical conduct and not having been sentenced for serious or minor crimes committed in the past. If you have just been released from jail, it would be best to obtain your visa before entering the United States.
The process to get the F-M visa is more difficult if you want to work during your studies as you need additional proof as part of your current academic program and to sign an employment contract with a US company that requires your service after graduation.
You will likely get permission to work through the Department of Labor (DOL) after passing the academic and financial requirements, but you may not be able to find a position without first signing the written contract with the local company.