how do you do that?

If you know what to search, this should only take a maximum of three minutes.

M4A preferably, but MP3 as long as it's 256 or 320. That's about it. Don't accept any others.
Oh well and yes CDs.

Everything in my library is 256kbps AAC, unless it's a demo or unreleased song

Itunes+ or 320kbps

320kbs mp3> itunes, its virtually identical and easier to find online. not here for the extra effort to find i+ quality, if i do find it first then w/e

I imported my CD and changed the import settings to Apple Lossless. It's amazing. I replaced my itunes purchased with this. It's better.

MUAHHHH!

mp3
192kbps is good for me but 256 kbps is optimal. Sometimes I'll just go with 320kbps cause they're the easiest to find.
CBR all the way. VBR sounds really bad to me.