Don't worry too much beforehand - all your questions will be answered during the trip, and the guides have everything down to a T. However, do make sure you are prepared mentally and physically: do some fitness and practice walks first, make sure you're organised, practise with your walking poles, rucksack and so on so you're not constantly faffing with equipment and holding people up. While lack of fitness won't necessarily stop you getting to the top, the fitter you are the more you'll enjoy the trekking in general. The days are mostly quite short and the distances covered small, but the altitude does make it challenging and tiring for the unfit.
Hire the sleeping mats (trust me on this). And do be prepared for some very cold evenings. A really warm down jacket and 4 season down sleeping bag are an absolute must - do spend the money (or hire them).
Make sure you have both a hydration bladder (difficult to drink frequently enough otherwise), and also 1-2 litre water bottles. Some days you'll need at least 3 litres of water during the day, and on summit night the bladder will freeze unless you can put it in your jacket pocket (as I did) or have insulated tubing (even then it may still freeze).
Don't stress too much about the Diamox issue. Whatever anyone tells you, the research about its use prophylactically is still unproven either way. Some of our group who successfully summited took it, some didn't, some took it halfway through. Do your research, make a decision, but either way, if the guides think you need to take it, they'll tell you (and if you don't have any, they'll provide it).
You don't need a yellow fever vaccination or certificate if you're on the group flights.
Despite many comments on here to the contrary, I never bothered with gaiters once - didn't have a need for them (the first 2 days were muddy, but I was wearing shorts). If you don't normally wear them, I wouldn't bother. You'll be dirty anyway after a week without washing.
This trip will be life-changing, whether you make it to the summit or not. It has a very good summit success record due to the extra days, but don't be discouraged if you don't make it, as even the guides sometimes have to descend due to altitude sickness.
Everything is organised exceptionally well, so book the trip, get fit if you're not already, and just go with the flow.
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