Hello Nima,
Welcome to Italki.
Please search here for professional and/or community tutors who help you to understand Dutch.
and book a lesson (or two) :-)
I am a native Dutch speaking person. If you need any help with correcting some text; you can also post it here,
so me and other Dutch speaking members can correct your text.
Small conversations with skype is also possible
Have a nice time to learn Dutch,
Kind regards,
Joost