Brother , if you want to study islam , the best book and study material for you is to read the Holy Quran.
Here is a link for you
Holy Quran - Surah Al-Fatiha ( verse 1 to 7 ) - Complete Arabic, English and Urdu Translation online
Secondly , as english is not my primary language so i cannot suggest you a good book as i donot know any one in english for beginners. sorry of this one.
Third , be aware from internet as you will find many false or misreprenst information about islam , so try to read the verified leterature.
if you are interested in comparative relegion between Islam and others you can vistie
Islamic Research Foundation - Welcome to IRF (then go to publications).
One suggestion that will inshahallah help you , go to the forums
http://www.islamicbaord.com and ask people about a good book in english for beginners etc or what ever you wish hope you will get a good response from their , the forum is bit slow but the replies are good.
Finally , as i said there are many false thing said about islam on net , so if you have doubt about any thing just try to confirm that one before accept that.
May Allah guide all of us to the true pat.