equipment/methods questions from a beginner

[Dixie Whistler]

I just got interested in wildlife photography and am looking for some tips.  I have a canon d400 that I can use with a canon 75-300mm lens.  What other lenses or equipment do I need (without sinking a fortune in)? And do you have any tips about how to take nice shots outdoors (shutter speeds, filters, etc.)  Or even how to set up to get a good shot.  Do you just crawl up in some bushes? I realize that this is a very broad topic.  Thanks

[Ol'Mossy]

I would suggest using a pop up blind to conceal your movement as far as the rest use your manual that came with it or use this:

http://www.tutorial9.net/tutorials/photography-tutorials/wildlife-photography-tips-take-better-wildlife-photos/