I'm going to answer based on what I DO and not what I should do, lol....
1. How often do you need to clean them?
Basically never. I have Acuvue Oasis soft lenses -4.75. I take them out around 10pm, put them in at 7am. If there is something on them, I might gently rub between my fingers. I replace them every 3 months or so or if one rips or starts to feel bad.
2. Are they difficult to put in your eyes?
No. I mean, of course they are at first, but now I can do it with either hand, without a mirror.
3. What is the differences between contact lens and eye glasses?
I prefer contacts because they give a more full range of vision. I have glasses that I actually like the look of, but can't get used to the lack of peripheral vision. My vision is pretty more, everything is completely blurred more than 1 foot from my face. With contacts I can still see while swimming or if I go skiing or something where I would normally leave my glasses behind. If my eyes get uncomfortable, there's always the option to use my glasses.
4. Is there anything else I need to know?
I would say that brand matters. My uncle is my eye Dr. so luckily I buy everything at cost. I used to use a more generic brand of disposable soft lenses but when he switched me to the Acuvue Oasis, they felt better and last much longer.
Coke (All-American 7/7/06)
Nikon (GSD 9/7/08)
Indy (All-American 5/10/12)
Legend (GSD 10/22/13)
Rainbow Bridge Kenya (GSD)