Hi Grace,
Nerves are not uncommon when booking your first solo trip but fear not, read through the forum and you will find many reassuring posts. Also, feel free to ask questions - if I or the wider community can help, we will!
In terms of Dubai, there are currently 7 travellers booked on the 6th October departure. The group is made up of 2 men and 5 women with ages from late-40s through to late-70s - still a few months to go on this one so I would imagine these numbers to change between now and then (so feel free to ask for an update).
We do get special dietary requests and have found that most countries, airlines and hotels are able to cater for these. We would ask that you inform us when you book so a note can be added to your booking and we are able to contact the hotel before you depart to make sure it's picked up.
Kindest regards,
Julia