Just brought a R4 DS Revolution, what to do?

I just ordered a R4 DS Revolution, and it gonna come in about 3 days I think. I want to get ready for it, so when I receive it, I know what to do and won't mess up. Like what should I use on the R4 DS Revolution, R4Wood or YSMenu? I'm new to Flashcart, I really don't know anything about them. Can someone tell me what I should do when I get the R4? Thanks :)

Your flashcard will unlock many possibilities for your Nintendo DS (Homebrew games, emulators, utilities, etc.). But first, did you buy a microSD card? You will need one for storing files in the R4.
For the OS, the default R4 OS will be fine, but if you want more customization, I suggest WoodR4.

I got a microSD card, so thats ok. I have a NDSL, never heard of Homebrew games, emulators, utilities, etc. Don't know what they are..
I found some OS(R4 Wood, YSMenu, Moonshell) I think R4 Wood is the best?

Wood R4 is the best IF you have an original R4 or one of the 3 clones it works on. If you don't you can't use it.Homebrew is basically games and other programs made by people like you.