I am at a total loss for how to teach my extracurricular class. I am supposed to use storybooks and read them with my class, but also prepare a bunch of activities to do surrounding the book. Without even going into what a challenge it is to navigate too-hard language in the books, I have no ideas in terms of activities because I have never seen a reading/storybook class modeled for ESL. I taught this class just twice last semester due to being a late intake, but the coteacher told me what to do both times and it was really low-prep. We basically read the story a few times, then had them draw some pictures. I'm assuming my school would like me to expand beyond this a bit, but I don't know how. I can make worksheets, and I think that's... you know, what it is - I'm wondering about more dynamic and interesting ideas (which, obviously, cannot include group work).

Sorry I forgot to mention, I only do this class with Grade 4 and the group is quite mixed. I had some students who couldn't read last week's book and others who knew all the words already. The school has actually chosen the books that I am supposed to pick from, but a lot of them have language that I'm struggling with. If I were teaching using only a PPT, I'd actually re-write the books to get rid of idioms, abstract language, etc. and tenses that the kids don't even know exist - but we have 20+ copies of all of these books. I'm supposed to use them. I'm struggling.

Does anyone else do this, and can you provide any tips or suggest activities?

My school even has a small budget to purchase materials, so I feel like I am really missing something being unable to come up with any ideas.

Not sure of the level - I teach elementary school.
I have given students a copy of the text.  Sometimes before and sometimes after reading the story, I would say a word (or write it on the board) and ask them how many times it is in the story and they have to count.
Or I could say/write the word and have them try to be the first to find the word and put their finger on it - sort of a game.
If they have their own copy of the text, they could underline the words they know (if they are very low level) or circle the words they don't know (if they are higher).  Maybe a triangle if they know what the word is/means but don't know how to pronounce it.  Another symbol if they think they know it but aren't sure.  This is sort of an evaluation but also a way so you know what to work on and how to help them.