Establish decent logs, and push keys on your own. Basically, prove you aren’t sitting on your hands and/or looking to be carried. Not having experience will be a huge barrier.
Find a raiding schedule that works for you. Typical raiding is 3 hours a night, and 2 or 3 nights a week, so just check the times.
After that, you’ll have to start hunting for a guild that will meet your experience level that needs your class/spec. The more versatile and capable you are at multiple specs the more desirable you will be. For example, if you can only one-trick BM, and can’t play Marksman, that will limit your options. You’ll want to play the best spec for an encounter, for example, so it helps to be good at all of them.