If you use bell service $1 per bag is usual.
When we take DME back to MCO i tip the driver $2. and also the person who handles our bags at the Resort Airline Check in desk.
Not sure if you are staying on points, or booked thru Disney. If you have daily housekeeping, most leave $1.00 per person, per day. Leaveing tip every day. Main reasoning is that your housekeeper may be different every few days, so leaving one big tip at the end may end up going to someone who just came on shift, and not the person who has been cleaning your room all week.
I have no idea about tipping when staying on points, they don't get daily housekeeping.
Hope this helps.