Nice! Clowns are always a good thing.I haven't done materbal incubation, but I've done quite a bit of reading on it preparing for my own clutch, so hopefully I can help a bit.
1) Aspen shouldn't hurt the babies, it's made to be snake bedding after all.
2) I've seen babies left with the mom until they're all out of the eggs.
3) Most people keep hatchlings together until they have their first shed and then separate them. You'll definitely want to work on finding a rack for them while you wait.
Good luck!