>>4275404Nice Cardinals. If your budget allows buy a used cannon 400mm 5.6f L lens. Can be found for 500-600 bucks. Leave it at that for gear, the rest is up to you.
Composition is personal but look at pro work you like. I like to use asymmetry rules of bonsai. Try to study some paintings/prints that depicts birds and get a better idea in your mind's eye what you want to photograph.
Most important be extremely lucky and twice as patient as you are lucky. Happy birding anon.