A few questions.

Hello, I seem to not be able to find a spade. I have raiding caravans, I have searched the entire map and I have not found a single spade. Can anyone tell me how too?

Also, is there anyway I can get a fullset of Plauge Doctor armor?

Spades can be bought at weapons shops.

With enough Necromancy Rank, and the proper ingredients, you can get a full set of Plaguedoctor's from the Bloodfountain.