Yeah guys, I suggest you get to know each other well first... And then plan any fun things...?
Also meet up at least 1x or several times online and ideally in 'live'...? (in a public place, with security measures undertaken, as if you were dating...)
Things to discuss are also levels of fitness, how many miles per day etc. How many have had experience with this already, who not? Budgets and such may come to mind too.. Background checks come to mind too..
Is anyone trained in reading maps etc?
If everything really went well.. a short one-day hike together might be better first?
Also know, on long trips, personalities can clash or work as a team... Are there huts to stay at on the way, with other people, and ways to 'return to civilisation' if someone couldn't make it or there was an accident or something?
(In the mountains, some places don't even have cell-phone access... And where would you recharge cell-phones? Otherwise, solar re-chargers? Maybe you need to economize and only have the cell-phone turned on for an hour a day or so..)
Anyway, things to consider... I've been on vacations or hiking trips with some relative strangers or friends, I always knew where they were from though

, mostly it was (at least some) local people, relatives or friends I knew from before..