Gigs and clubs are always tricky, low light to intense backlight and godamm awfull red fills.
Clubs are usually fine with flash ie. Dance nights, DJ sets etc but gigs can be awkward most venues some venues and artists dont allow flash as all, if you can 2nd curtain flash gives some grat effects. So for these you need to rely on good iso on the camera and faster lenses. The 50mm F1.8 is pretty much a must for a started and indeed most gig togs will still use one. There cheap (about 70quid) and small and compact and with an aps sensor (all of the canons in your range will be aps) you will get a bit of reach.
As for the camera, I use a 7D for gigs and have a spare 50d which covers all I need. I can push the iso upto about 1250 at darker gigs and still get decent results.
I find a 10-22mm wide angle gets some very interesting shots for gigs especially from the side line or right in under the singer.
Also be prepared to do b&w conversions as a colour washed out shot can look great in b&w with the contrast and shaddows messed with, like the 70's indie and punk shots.
If you look at my profile you can see the gear I use for gigs, its not cheap but worth working towards.
Oh and enjoy it, its great fun.
Simon