Looks at the reviews people have posted. I have not done this tour so cannot comment. I have done many other tours.
Clothes, dress for comfort and layers works best, comfy shoes.
Money wise budget for meal drinks and comfort stops and souvenirs, I normally take cash, and then credit and debit cards as back up just in case. People normally buddy up for meals if they are not included depending on your meal taste, you do not always stay in the whole group size.
Also allow money for extra excursions, flights, things to do while away either with the group,or independantley
It all works out very well, I have seen the world in a very safe way and met some great people on my journeys.
Cindy