Would like to get an understanding of how to control solid state relays. I took a peek at the documentation for wiring a relay and they added that a flyback diode should be wired in. I'm not sure the specifications for what diode to use. Also wanted to know if there are some base "settings" for controlling motor speed.
Here's a pic of the project. Go easy on me please. Lol.

 

I am no engineer so my knowledge is limited. I wired solid state drives for a living for many years though.
I have read your post and I have no idea what motor or other are you are controlling? If that parameter is set, the voltage and current draw is know, the wire and diode size can be selected, for starters.

 

Yes you'll need a flyback diode for controlling an inductive load whether its a solid state relay or not. Many mechanical relays have onboard flybacks, some SSRs for automotive use do as well.

 

I will be using the Haltech 100amp Relay to control a Davis Craig water pump. And I a MSD Ignition relay to control 2 fuel pumps.

 

Thornwave Labs has some clean products that are easy to work with and mount in a normal ANL fuse holder. They also run an onboard flyback diode - I've used them a couple of times.

Thornwave Labs