Hurrah...........you gottum.....great
Frustrating about no card yet.....
................Still, I think the first charge of the battery can take some time to complete, so you will have to be content with studying the manual and all the buttons till it arrives.
You are right about the filter size, both 55mm ( I had misread and thought it was the 70-300 and not the 75-300 lens that was coming..my mistake sorry ). In that case one filter (uv) would do if you were happy to change them about..........but at the picstop price one each would save a lot of fiddling.
Best of luck with it.........you will enjoy it once you get familiar with all the possibilities.........