Stippling would be FMQ and would use the foot for that.
SID is generally a walking foot but some people have good luck with zipper feet or special SID feet. Personally, my SID is never actually IN the ditch. I tend to always be off a bit. I drive the sewing machine like I'm drunk as soon as I try SID!
You will get many answers regarding where to start. I think most people start in the middle to push any fullness toward the edges, but some people start from one side. I start at the middle in hopes of getting fewer puckers.
It's all kind of a learning process. Listen to all the advice and then give it a go. What works for one person beautifully may not be what you want to do.