You'll get on fine with that. As I said above, I think it'd be good advice to take photos for a month or two and then analyse what you're taking most photos of. At a guess I reckon 60% of my photos are of our children, 30% landscapes and 10% the rest - close ups, insects etc. If x% of your shots are of a dot you know to be a bird of prey, perhaps a long lens will be useful!
Don't forget tracking a moving bird such as the high flying osprey through a long lens is incredibly difficult - you lose sight for a moment and all you see is sky in every direction. Wait for it to perch!
I'd leave filters for the time being, except (big except!) a skylight or UV filter to put on the end of each lens just as protection for the glass.
You mention peli cases. I don't have one but know they have an excellent reputation. I think you'd only need one if you were lugging your gear through airports, on planes etc.
I mainly use a small crumpler bag like
this one, which can carry the camera and spare lens, plus a few accessories. I also have a rucksack which can carry everything and also has room for dayhike kit,
like this
Finally, as I said above, I'd get one or two
remote releases and read a lot of Ken Rockwell's site. The other thing worth considering is enrolling on a night school course. A friend of mine is currently on one and learning loads.
Happy snapping.