I'm not sure why some of you suggesting OP to learn Russian when he need Ukrainian language.
OP, you have too look for some online courses to learn languages. There is some apps like Duolingo which may help.
Russian language is for use in Russian federation. Ukrainian language is for use in Ukraine. Speaking Russian in Ukraine is like speaking Spanish in USA.
It's not very accurate comparison because in Ukraine most people understand Russian, but Ukrainian is only official language there. And after 2014 Russian language is becoming less popular.