the most important difficality for me is phrasal verbs their meanings and their use
There are thousands and thousands of phrasal verbs and learning them, understanding them is difficult for most English speakers, even those who grew up with the language. Only by speaking English regularly and reading the language (looking up any unfamilar phrases) will you build your vocabulary.
A good site the help you is: http://www.thefreedictionary.com/ Here you can put in any phrasal verb and it'll explain it to you.
If you wish to learn new ones, try this site: http://www.englishclub.com/vocabulary/phrasal-verbs-list.htm
Hope this helps,
Mrs Finn :)