If you plan to DM:
For immersiveness, I recommend miniatures to use on a grid (can be just paper with 1”x1” squares drawn with a pencil). One thing I can say for doing it cheap and quick is to buy a bunch of those small game piece holders (1”x1”) and find monster art online to print, cut, and put in the holders as your minis.
[For example](LLMSIX 24 Pieces Game Card Stand Clear Card Holders Plastic Place Card Display Stand Photo Card Holder DIY Board Games Stand for Business Cards Price Tags Labels Menus Party Favor)
You can get basic rules online for free and you could probably pick up books used.
Really? Anything above Nintendo it has been true for me.