I've got a thermocouple that outputs a few milivolts according to the temp of a flame. I want to read the voltage on an arduino input to control a valve but I'm wondering if I should rather amp up the voltage so I can get a better readable range for controllability. What would be the best way to go about it? I'm not so hot with op-amps so if someone might have some kind of word they can throw at me for research that would be great. Thanks!
I would try Google on "Arduino + thermocouple".
Lors vas been built.
There is a suitable module for this purpose.
It's the model :
https://pt.aliexpress.com/item/1005006135690275.html
It uses CI MAX6675 .
Datasheet : https://www.analog.com/media/en/technical-documentation/data-sheets/max6675.pdf
Where's the fun in that? 
The problem is most of those relate to k type thermocouples you buy standard. Im using one of the safety thermocouples you get in gas stoves.
??????? ?????? What????
If I had known it was supposed to be funny, I wouldn't have posted my response.
So...learn?
Add the type You use to the Google search.
Datasheets often contain applicatiions.
Late reply I know but my comment was related to trying to build something and learn from it instead of buying off the shelf parts. There's nothing funny about the topic. I did however say where is the "fun" in doing that.
Well that's been the goal so far. Getting there slowly.
I did eventually make my project. It ended up working for a wonder. Thanks for the help.