if there are existing employees I'd make sure they're all regularised,
make sure paye, prsi etc is up to date,
I'd also ask about whether you've to provide a prsa option and the costs to you.
I'd also want to know about their severance payment rights, eg, some might have built up rights for 5 yrs if they're with current owner since start, X whatever no of weeks statutory redundancy.
Make sure you know their agreement on holidays and bank/public holidays, sick pay, maternity, holiday pay etc and that it's all in the current books and calculations.
check out if there are employee disciplinary procedures and health and safety requirements in place.
I might be a bit of a worrier, so maybe not all the above apply, but best to make sure. hope it helps