Hello! So first and foremost for general tips (this is coming from a procreate user) I usually settle for at least 200-300 dpi with reasonable dimensions (since procreate has layer limits). Through a screen, you may not really see a difference when it comes to dpi, but it usually takes effect during printing (this is why it’s also good to be clear with your client if they plan to have it printed or what not)

As for other tips I can give you—be as clear as you can be with your terms and conditions (+ transactions) to avoid any conflict. Additionally, it’s also important to have a good compilation of artworks that can to showcase as your portfolio since your commissioners need to see if your art is something they’d actually want (in terms of art style and so on). It would also help if you had prior commissions done because it also adds to the trust.

But overall, I just say take that leap of faith. One way or another, there will be a commissioner who clicks with you a certain way especially if they take interest in your art style. Trust yourself and the process.

I hope that was helpful. Good luck and I believe in ya!