Trying to design a part, have a few questions.

[curious aardvark]

probably just need supports from the plate.
everything else should be fine. Although the edges of the semicricle aren't actually attached to the centre.
Supports won't help there it'll just print a lot of spaghetti.

Weird looking thing. Clearly not designed by someone who's used an fdm 3d printer :-)
Not a criticism, just an observation.

What i would suggest, get your printer. use it for a bit, do some simple designs and then redesign the part so it doesn't need supports, is a lot smaller and works better with the printer, and prints lying flat rather than sticking all up in the air.
It would make it stronger and cut down a lot on printing time.

The only time I've used supports in the last 4-5 years, is when i've copied a broken part of something in the house.
All my original designs, have not needed supports.

It's easy to do, but get a bit of experience with what your printer can and can't do before you start designing anything of any complexity.

Using supports, is a pita. Slows things down, wastes plastic and on a single extruder setup, they're generally bastards to remove.
If you don't absolutely need them - don't use them :-)