I'm a Nikon user, so no advice on which model from me. What I will say is that you should consider size and weight if you're going to be carrying your purchase on walks.
You can get decent shots using any modern camera body, so think more about the lens(es) you want. A telephoto lens is where most of us start and I see that Canon offer packages with a 18-135 mm lens. Research that one and see if it gets decent reviews. Once you have done your course (good idea) and done a bit of photography you'll know more about what you really need to achieve what you want.
For prices you can look here and elsewhere on the net.
Oh...an afterthought. Is there a camera club near where you live? They will be a good source of advice.