I can get a near perfect dowel with this method. I usually do one linear rotary with a larger stepover and some stock to leave, then do another to finish with a tight stepover and no stock to leave. As opposed to turning continually like one might expect to see on a lathe. 'Line' will machine up the length of the stock, rotate a specified amount (stepover) machine up the stock again, rotate etc. I use the line style as spiral has not worked well for me. In the passes tab there are three rotary pass styles, line, spiral, and circular. The radii tab is the same as your heights tab, adjust in the same way. In the geometry tab under rotary axis, click the dropdown menu and select 'rotary axis' then select the cylindrical part of your model. I think I had to find it in preferences under preview features. This is located in 'multi-axis', I'm not sure if this is in the toolbar by default in the latest version of Fusion. In terms of toolpaths, there is going to be a variety of things to explore but the most basic may be the rotary toolpath. This is quite important, if you don't do this the spindle will not move to your turning axis, but may crash somewhere else on your table. When you get to launching your program on Mach 3, make sure 'turning' is on and the work offset is showing the number 6. In the post processing tab you will also need to set your Machine WCS to 6, to match that of the Maverick. The WCS origin needs to be on the left / operator end of your stock, in the centre of the turning axis, as in the image above. This is my setup for a test I was doing including a mortise in a 1.5' diameter straight rod.

I would start by turning a basic 1.5' or 1.75' dowel.

I was in your shoes a few months ago, I can probably get you where I am at on the topic.

Woodworking fusion 360