Looks to be a 40D body, a bit dated but nothing you should toss out. Should do just fine for posting photos online or smaller prints. Its as old as my current body.
The 18-55mm Canon lens looks to be the "Kit" lens, one that you could buy as a bundle with the camera. Nothing to special, not the best in the line up but great to get you started. Again, not something to just throw out or dismiss.
Canon 18-55mm - Super Wide Angle zoom. Used for Landscape or Architecture/Real Estate type shots all the way to possibly some portraits at 55. Not sure exactly which version of this it is, but they aren't to different the newer ones just have stuff like image stabilization on them. This looks to be one of the earlier ones without it. Something like this, small and light with wide angle and decent focal length for some close details is something you might choose as a walk around lens if you didn't want to carry anything more bulky like one of the bigger zooms.
Canon 75-300mm - Looks to be an EF lens which means it will fit full frame cameras as well (this camera is a crop body). I call it a Standard Zoom, it's sorta a telephoto I guess. Use for reach, to get closer to something without actually getting closer. Wildlife, distance shots, pretty versatile since it covers 75 to 300mm. It's the third version of this lens. People are quite hard on this lens in the Canon world, they aren't to fond of it's image quality. I think for a beginner it would work until you could afford or decide on something better.
Sigma 50-500mm - Hard to tell which version it is, looks to be maybe one of the first models. Again, not top of the line but just going off what I read I'd be tempted to use this before the Canon 75-300. Plus you have extra reach with this. It basically overlaps the Canon above.
Sigma ??? - Can't read it have a better photo of the last one?
All together a decent kit to start, though you do have a lot of overlap with the lenses especially if that last one turns out to be a similar zoom like I think it might. Since they are zooms they can be used in all sorts of focal lengths but then you start looking at the F values on them, and they are all a bit slow (Lower the F value the "faster" glass it is, better for low light, etc). So you have nothing to really differentiate between them all. If say you had a zoom that could shoot in the 2.8 range you might consider the overlap with your normal 4-6.3 type of zoom as acceptable as you would probably use them for different subjects or at different times.
Looks like you have a battery grip for the camera too, thats cool....I personally love the battery grip, I buy it with every camera. Though it does add weight and bulk.
It's going on 3am here, I will check back here tomorrow and speak some more and clarify anything! Who knows if I'm actually making any sense.