I don’t have too much experience on this matter, but I can reveal some secrets that you want to know….
I got line6 toneport gx today, and all I can say is wow!
I’m an amateur when it comes to editing/mixing/recording, like you, but this thing really satisfy my needs at this time
it’s a device that gives a lot from the famous POD system, a lot of amp setups, a lot effects, a lot of fun in general
it’s really easy to use, it has an USB interface and it doesn’t relate to your soundcard at all
plug and play system, no problem at all
good speakers, at least a subwoofer are a must have, but you can get that for low expense, that’s for sure
at the time being I use only cool edit for mixing backing tracks with my playing
that’s also a very useful and user-friendly program, you can record a lot of channels with no problem
as for cubase and other ”advanced” programs, I don’t know much about, but I’m sure people from IG know a lot
peace mate