If you need to purchase a guitar, here is one that I recommend. A number of my students have bought this guitar and have been satisfied with it. It is a decent guitar at an unusually low price.
Rogue Rocketeer RR-50 (for students under 5' tall)
Rogue Rocketeer RR-100 (for students 5' and over)
Note: Guitars must be ordered online; not sold in Guitar Center stores
Why electric guitars are better: While it may seem surprising, electrics are much easier to play than acoustic guitars are. This is because the strings are easier to push down and the smaller size of an electric guitar fits students' hands and bodies better. I find that my students who use electric guitars progress much faster, enjoy their experience more and stick with playing guitar longer. No amplifier or other items are needed at this point.