Feel completely at a loss trying to get into The Old World

Hello!

I have had this strong urge to get more into fantasy things lately as opposed to more sci fi stuff like 40k(I know it’s still fantasy heavy). I really like the look of square bases for The Old World.

A friend recently offered to sell me the chaos half of his core set and I’m very heavily considering it. But it also seems like this game is kind of a mess? Trying to find a lot of information seems hard. Also, how many armies can be played entirely in plastic? I was browsing the chaos range and saw a fair amount of kits in resin.

Do I maybe just need to go to Age of Sigmar if I’m looking for all plastic and good lore?