>>1895705that's fairly easy.
for the background just click on background in mmd and select load background picture file and select a red background pic (even a shitty image made from paint works, for best results the pic's resolution needs to be the same as the screen size of mmd). after that select show background picture.
for the hand gesture, you can make it quickly if you use the grabbing hand pose files from your default pose folder (they are named 右手半開き and 左手半開き, for right and left respectively), then lower the thumbs and the wrists, and play a little with the shoulders and arms. also lower a bit the middle bones of the other fingers so it doesn't clip between them.
here's an example with shmb, whose model should be in the resources page from OP
