If you are working with children who are in the Eyfs (up to the start of Year 1) then they will need a key worker.
The best type of planning comes from their interests... so you observe, listen to what they are saying, get info from parents and other settings and then plan for their future learning and development.
Your planning should also show how you complement their time elsewhere - so if the children are coming to you after school, you might show planned time for homework with support from key workers, planned time for free play because they have been busy all day (free play with games provided which follow their interests)... then planning for seasonal and other events you want to mark with the children through the year.
I think the first year will be the hardest, then you will have systems in place to follow through for next year which will just need tweaking to show they are following the current children's interests.
I hope this helps