Help with Russian Catholic prayers

I live in the USA and I just found a Catholic church that says mass in Russian nearby and I am wondering if you or anyone you'd know would know the basics of Russian prayers. I've tried to google this and have had no success. I already know Отче Наш and Радуйся Мария. I also know them in Old Slavonic. But, are there any other things that I would need to know, any responses or other prayers? Also, are Catholic masses in Old Slavonic, or is that just Orthodox services? Any links or anything would be greatly appreciated!

I speak Russian by the way, so I may be able to jump in, but I'm unsure.