Just a question...

Ok I’m new and what not mostly to three 3d arts and what I’m wondering…is it ok to use a base mesh? In the 2d world that’s pointless as you can probably imagine…however there’s big difference when adding that third d…so yeah…Iz this kosher? Obviously there will be modifications made after loading it but initially?

is it ok to use a base mesh?
You can use whatever you want, a cube, a character mesh, a single vertex etc
Look at Shift+A / Add menu as well as blendswapor additional addons for various base meshes

Yes. You can use whatever you want as long it’s legal (copyright, licences).