IF the DV Lottery will be held again for the next year, registration will begin 1 October. There is no currently active website to register for the lottery. First, you will need to check which countries' citizens are eligible to register - that should be announced shortly before the next lottery registration period opens. All applications which are not drawn in the lottery are destroyed.
"Winning" the lottery ONLY gets that winner an interview for an immigration visa. No guarantee of actually succeeding in obtaining a visa.
Since those who actually succeed in getting an immigration visa to enter US, you really need to have sufficient funds of your own to settle in US and support yourself until you can find a job earning enough to support yourself. Expect to need USD25,000-50,000 minimum to move to US, get a place to live, cover all your living expenses AND job-hunting expenses, etc. It could be a long time trying to find work, and US is a high-cost, high-tax country.