At first,you must know that Chinese is way more difficult than English,so you need to build up confidence to have a good mastery of it...BELIEVE IN YOURSELF.Then you can find some simplified grammar book...you don't need to learn grammar deeply,but you should study a little bit about it...and you can visit some website appertaining to English study..and reading some newspapers online can be a help,too.And you also can find some native speakers to practice with...Watching online English movies,and read lots of books..like《书虫》系列的书...hope you succeed