As the title says, can anyone help me out? I have no clue on how to record...
Custom Strat
Boss BD-2 Blues Driver
Electro Harmonix #1 Echo
Fender Blues Jr.
Crate V18

“America is all about speed. Hot, nasty, bad-ass speed.”
-Eleanor Roosevelt, 1936
Well, then you need to check the Cubase help file first (or the manual if you have it handy) because that's a large topic right there. Once you figure out basic recording you need to use Amplitube as an insert effect on the track you're recording. Unless you have a massive store of RAM and a fast processor monitoring plugins during recordings tends to produce latency that's more or less a bad joke so be prepared for that.