>>538728893
Format will be Pauper, you can read about it below. To find a deck, make one on Moxfield or just google for a list you can use.
https://ultimateguard.com/en/blog/pauper-beginner-guide-rules-best-decks-format-explained-magic-the-gathering

Here is a few decks on MtGoldfish you can play with.
https://www.mtggoldfish.com/metagame/pauper#paper