What do you spend your first development points on?

[Oddible]

I tend to drop a point in Trade first as trading is so crucial to get an economy going. Then it depends on my region. I like Sheep because that adds to my income if I sell them. In my current game I have a very green territory so I'm going Plow.

My first few playthroughs I started food stuff (Traps and Forest Mgt) but I've found food isn't so much a problem as I thought it would be.

[Smyt]

Well you have 5 years to figure it out. Another early access nonfinished game

[Peo01]

I've diversified my first town until the realisation set in that I should've probably focus build.
My 2nd town is going full farming, though I'm tempted to do a proper restart since I've learned a ton of things in the 3 hrs of my first playthrough.

[The Mogician]

Honestly, depends on where you are at. You need to make regions focus on their strong suits. Got rich deposits of minerals? Go with mining and industry. Got fertile land? Farming for you. You can't get everything in one region so play to your strong suits.
I usually prefer an agricultural start since food is quite important. However, if you don't have the fertility, just go with something else (or restart the game to pick a different starting location).