Yes, there are mainly four tones, with an exception of a neutral one, which sounds much like the first tone with less stress or amplitude. For example, 了 at the end of phrases or sentences is pronouned this way.

yea, 4 tones. This articles introduce some knowledge about Chinese tones, hope it will help you. http://www.onlinechineselearning.com/resoure/learn-chinese-phonetics.html

yes, four indeed... 1 = --- = even 2 = / = rise 3 = V = fall-rise 4 = \ = fall

here is a light tone apart from the 4 tones. 了 啦 的 吧, words like these are spoken in light tone. "明白", "头发", in these words, 白 and 发 are in light tone, too there are also other examples but I can't list all of them. besides that, some model words have special tones which won't be written in a dictinary, but we pronouce them in daily life. for instence, when we feel disgusted, many of us will say "yi~”, this sound is hard to discribe with pinyin as for how to procounce the common 4 tones, you can just type some words in translate.google and listen to it, it may not sounds very natural but basecally standard hope that can help you

Yes.there is! If you have any questions on the Chinese, you can come to me.