I agree with both the previous responses, The gear you have is fine, I use a 70-200mm myself sometimes hand held sometimes on a monopod. As long as you keep mobile this is long enough, just.
I also shoot on aperture priority as I find that this is quicker to change on the fly. My lens is f2.8 so I vary from this to f4 depending on light and what depth of field I require. I try to shoot at ISO 100 but will push this up to ISO 400 and above if required.
I am still learning myself but I have my best results using the above information. I also find that it is useful to change settings and try! As long as you look at the data after you can quickly learn what works and what does not.



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