Re: New camera for beginner
Photography is not easy, particularly wildlife, don't expect a stroll in the park, if you want to learn it you need to immerse yourself, practice, study, practice, study, rinse, repeat.
Dont expect to walk through this course and suddenly become a professional. Its also almost essential to be any sort of photographer to be mathematically inclined. Photography isn't just 'look at the pretty scene', point compose and shoot. There are tonal values - high lights, shadows, image grain, focus placement, focus transition, white balance, depth of field, abberation, barrel and pincushion distortion, etc etc. All must be evaluated and executed on the scene.
DSLR imaging is also very expensive, and to do wildlife photography for a company professionally will require a lot more then double that budget. Pentax is not the only company that provides weather resistance, they all do - pentax provides it on more of its models including its entry level.
For wildlife you'll need a strong telephoto zoom, or zooms, something such as a 70-200 f/2.8, or the 70-300 f/4, and a prime 300 f/2.8.
If you want to do it professionally in any market, give up any and all automated modes, confine yourself only to shutter/aperture priority, and full manual. I wouldn't bother wasting a dime on any course if you ever plan on using an automated mode.
Olympus also has an advantage for outdoors use with its smaller and more lightweight gear. They also provide some sealing on their cameras.