Learning to read Pinyin is very important for learning Chinese. Pinyin is the official transliteration system of the People's Republic of China and also used by the UN and most textbooks and websites. Pinyin is written with the Roman alphabet, but each letter(or combination of letters) represents a Chinese sound totally different than the sound in English for that letter. For example, Pinyin's "x" is not pronounced like "ks."
Since it's not practical for me to use letters with tone marks on them, I(and many other websites) specify the tone by the number of the tone next to it. 1st is the high, flat one. 2nd is rising. 3rd is low to rising, 4th tone is falling, 5th tone is neutral(depends on tone before it). Note that I haven't just arbitrarily picked this - anyone who has studied Chinese will know that the 1st tone is the high one and the 2nd the rising and so on.
Here is an excellent website to learn Pinyin made by a Harvard professor:
http://www.courses.fas.harvard.edu/~pinyin/