Personally, no. You shouldn’t start a commission before at least a month of working on blender. I have seen many people do commissions every early on, and that has made them not improve as more and not get many commissions.
I agree with @MrMoled and @Bes_oke, if you feel that you are ready then go for it but take in mind that you can always learn something new and that you should take the time to get used to blender. As for prices, I recommend checking other portfolios and see the prices they charge or charge what you feel is right.
i understand, but by doing commissions it gives me alot of practice and makes me wanna try my very best, i just got commissioned for a thumbnail and i feel like i succeeded
I feel like you are prepared enough for smaller commissions, just take your time and find out when you are ready, you can keep sharpening your skills and trying other kinds of GFX’s else it’s really just your own decision.