Hello Kiu Hwa,
I think that sounds like a good plan! Especially with MidJourney V6 just around the corner, just start with MJ first :-)
It's almost "hard" for MidJourney to create any "bad-looking" images, it may not follow your prompts 100%, but the MidJourney images are 99% decent-looking and tasteful. Learning about some extra tricks and MidJourney features (especially the inpainting feature) can also help you achieve results closer to what you want.
I'm so excited for you! Feel free to read my MidJourney articles in this folder: https://henriquecentieiro.medium.com/list/all-about-midjourney-47509142d455
And you're welcome to let me know anytime you have questions or anything to share! Happy learning 🥰
-Bee Lee