DNA things

[Kit]

Can someone, in very simple words, explain the testing process and what happens next?

I'm thinking about doing it but having totally ignored everything about it I know nothing.

I'd also like to know 1. is it a cheek swab or spit in a tube or does that depend on the company?
2. If I test me, OH, my Dad, OH's parents and a cousin and I pay and send in the tests do I get the results back or do they go to the person?

I don't get the letters and numbers and stuff, will it make sense once I have results to look at?