I remember when I needed to buy a house in Ukraine and it was hard for me to know where to start. I can definitely say that it is better to turn to reliable people for such cases, who know the specifics of how to do it and then it will be much easier to buy a home. For example I found https://en.clc.co.ua/buy-apartment-ukraine/ here and they helped me a lot at all stages of finding, processing and buying an apartment. I hope it will be helpful to you as well!