Another newbie question

Sorry again here,

So writing a post final war story with a fresh class of 20 students, story wise their physical appearance at times is important so my brain is saying,

'Well gee, I need to draw them all so everyone can see them'

My drawing skill sucks

And I'm assuming writing thousands of words worth of physical description wouldn't fly, especially since in some cases it won't matter for a long time,

So can I just write and bring up whatever as needed? Wait till I can draw before posting, actually do a large info dump, make individual character intros (which would be spoilers in some cases)

Or am I overthinking it all 😅