As for the lens, I saw your list, and if I may, I would like to recommend some thing that might interest you.
There is the
24-105mm f/4 is usm lens that is an extremely versatile lens, and since you are running on a cropped sensor, that actually make it a 38- 168mm lens (correct me if I'm wrong) which make it a very nice candid lens to photograph moving kids from a little distance. (this is my walk-around lens and I couldn't recommend it more. Amazing piece of glass)
If you're able to get a bit closer, I couldn't recommend more the
24-70mm f/2.8 II USM.
This is just a fantastic portrait lens.
Both of them may be a bit on the expensive side, as they are professional quality lens, but you can rent them for very cheap at your nearest camera store and on
Borrowlenses site.
The lens you mentioned are good, but may be a bit hard to use, even more so if you plan on using a priority / manual mode, as the aperture of the lenses are variable depending on the focal length of your lenses. Not exactly the most intuitive thing for someone who's starting out.
Btw, Canon software is "okay" but not "great". if you plan on being serious about photography, I'm personally using lightroom, I do not know any free alternative that was worth the effort.