If you are good at iso then sketchup should be a breeze for you. I use parallel projection, not perspective, and start all of my drawings in top view. Once the basic shape is drawn I then tilt the drawing to whatever is a convenient angle. Now you are drawing in a 3d view. Using guide lines, guide points and the compass feature is very helpful. And always break your drawing into lots of groups. Otherwise it can be very time consuming and even frustrating to fix errors or make changes. You can draw in feet and inches or metric. In feet and inches you can draw in either fractions or decimals. In decimal inches the precision is 0.0000" In fractions the precision is 1/64"
I find online tutorials to be slow and time consuming because you have to constantly jump back and forth between your drawing and the tutorial. Much easier with the book because you can have the book open while doing the drawing. Or if you have two computers that would work to. One to do the drawing and one to have the tutorial.
A couple of hours doing a drawing to get the basics down and you will be on your way to quickly draw anything that you can imagine.