I'm just gonna share what programs I use right off the start because I see many deviants are constantly getting asked which programs they use.
To draw digitally, I use Clip Studio Paint
it costs around $50.00 USD, but it's very worth it
because there are many nice features that come
with the program.
To edit backgrounds I use Adobe Photoshop
cc, it's also a very neat program
I enjoy using clip studio much more though due to
many of the features photoshop lacks.
bye~ have a wonderful day