I'm looking for an English speaking course, can you recommend me some ebooks?

You can look for ebooks at

freeenglishnow(dot)net

www.britishcouncil.org, you can also attend free classes almost all year long,  

Try this website: www.alison.com

You will find different training categories, choose "Languages", then "English"

http://alison.com/learn/English

There are endless numbers of English Teaching sites so that you can learn on line such as;

http://www.free-english-study.com/

http://www.english-online.org.uk/course.htm

https://www.youtube.com/user/PrivateEnglishPortal

I recommend some sites such as englishtown