first u need to have 4k watch hour and 1,000 subscribe in the past 12 months, then u will b reviewed and if u pass the member ship u can monetize ur videos It is shortly using ads, Also u need to create AdSense account, don't worry it is the part of the process, then u will be paid for ur view and ads view or clicked depending on AdSense whether they do CPM or CPC But first of all try to get 1,000 subscribes and mostly 4k hours, means around 250,000 minutes of ur video must be watched in the past 12 months