Welcome to FF ! Pacmans are fine for beginners as long as you set-up the right enclosure in advance and feed the correct foods. Other than that, get a fecal exam at your local veterinary to ensure it has no parasites and you are set-up correctly. Be aware Pacmans (and frogs in general) are not "hold me" type pets since it stresses them out.

The enclosure you mentioned is too big for a young Pacman, so can place it inside a smaller plastic keeper or divide a smaller section of tank for frog. Once it gains size you can release in it.

Food depends on size, for babies feed daily a few gut loaded crickets the size of distance between eyes or cut-up earthworms no more than it will eat in 10-15 minutes. Mine will loose interest in food way before that and eat their fill from tweezers in couple minutes. Red light is fine; but might need to remove UVB/UVA tube, specially if an albino. Recommend not feed fish (specially goldfish) and do ensure bath water is dechlorinated. Good luck !