You have a camera and two lenses, total? You can get a bag for that just about anywhere. Best Buy.
If you need more, look here.
Understanding Exposure by Bryan Peterson is pretty good at teaching the fundamentals of photography. It’s focused (heh) on teaching you about how to choose shutter speed, aperture, and ISO - or in other words, exposure - as opposed to white balance and such-like. For specifics like what the various autofocus settings on your particular camera do you’ll want to find a guide book for your specific camera.
If you’re like any other camera geek you’ll go through a million bags before you finally figure out which features are important to you.
I am particularly fond of non camera gear pouches so I don’t have to carry a purse when I carry my camera bag. External waterholders are nice for when you’re hiking, an easy access zipper so you don’t have to take everything out to get to the camera.
I am a fan of both Lowepro bags and Tamrac, but I’ve recently been poking around the Crumpler Canada site looking at some nice looking “not obviously camera bag” bags. US version
And yet still too short to be a fully adequate birding lens ( really, you get frustrated quickly even at full extension and with cropping - you’re always wanting just a leeettle bit more with wildlife ). Everybody needs something different, thankfully there are lens for almost everybody ( if you’re as rich as Croesus ;)).