How can I make sure that my use of cases and word order are correct when I write in Russian?

Cases and word order are two key - and probably two of the most crucial - aspects in Russian grammar. Understanding and gaining a thorough understanding of how they work is the basis to then build from that and develop your thoughts in Russian. The more you'll be able to work with cases and word order in an almost natural way, the easier it will become for you to express your ideas. Grammar comes before vocabulary in this sense. Vocabulary is always something you should add up to the foundations (grammar, in this case). Learning words is not the most complicated thing when learning a language, in particular a complex language like Russian; what is complicated is understanding how they connect with each other. This is why you should practice and make sure your use of cases is appropriate in the sentence you're creating and then you can work out the word order from that. We will go through that together and if you have any questions, feel free to ask, because it is only if you have totally understood that you will improve. So I want to make sure I can help you with that. So feel free to ask at anytime, I will be very happy to answer any questions you may have.