I went to a Braves game last year. Since you're staying at All-Star Sports it should be pretty easy, a bus will come straight to your resort and drop you off at the park. In general, these buses run only every 30 minutes so be prepared for a longer wait.
If the forecast calls for rain, trust me and bring the number for a cab company. Rain outs mean the entire park leaves at the same time, not just the ball game crowd. You can't bring umbrellas in either though ponchos are okay.
That's the concession menu for the upper level section from last year. Prices may have changed but I believe the menu should still be fairly accurate as it was after the rebranding when I took the photo. Be aware that nachos and cheese mean a bag of tostitos and warm cheese. Not bad just not typical.