OK, forgive me, I'm blonde and female<G>

I need an extremely basic and simple (step 1 do this, step 2 do that) guide to help me set up working locally.

For instance... I have instructions that start "Install to http://localhost/yourfolder/" and I'm even stuck on that!!

I have downloaded and installed xampp, it tells me it's working ok. So now what?

TIA!