You need not only a Russian speaker, but a Russian speaker who knows grammar and how to teach. If you live near a university I'd advise trying to take a course. Learning on your own is extremely difficult for most languages, Russian being one of them. Check the section here on learning Russian and look at the list of recommended books. At the least you would need, if studying alone, a book and CD. BTW, how do you know whether you are pronouncing the words correctly? How do you say что?