You can go to the American Orchid Society web site, AOS.org and on their home page under membership I think it is, pull down that tab. You find culture sheets there. There is one about growing Cattleyas. It is a downloadable printable file that will give you the basics.
Those are three hours of direct sunlight, morning better then afternoon.
Repot every 2-3 years. Keeping the mix fresh so the roots do not rot.
Water in a 5" pot roughly once every five days. Let it go dry a bit before watering again.
Temperature range of 55-85.
The key to orchid growing is healthy roots: healthy plant!!
Welcome.
Browse our Orchid Forums because they are full of wonderful threads with lots of questions, answers and great people who love to help! The current bloom thread "what is in bloom for May 2020" has daily posts of beautiful images. Again good luck!