I run a wee whisky club in Aberdeen. We started with 8 regulars, but recently decided to expand the group to 12, as we wanted to get 8-10 every meeting, mainly so the income was maintained and we could get 3 decent bottles. The Club pays for Glencairn glasses (which are essential for portion control, in our experience) & the whisky. The fees are kept in a jamjar, and we have a wee bookie for income / outgoings. That's about it!
We haven't found a pub yet, so it is held in member's houses, rotating each meeting. Ostensibly, the Club should decide what we go for every meeting, but invariably it comes down to two of us to decide what to buy, where & when the next meet is. That certainly isn't too much hassle.
We are nowhere near as big as the Glasgow whisky club, and I must admit I am envious to their success and modernity; website and everything! However, to prevent descent into a free-for-all from the start, I do insist that we mark the 3 whiskies bought (and the host's wildcard). I take on the minutes / scores from the meetings; that can be a bit onerous, and there isn't too much evidence of the rest of them reading them, but it is a useful reference later on.
I'm also in a share club, where such things like rules, constitutions, etc... are definitely required due to values involved, but for our whisky endeavour, there is no real danger of being short-changed. The host brings out his collection for sampling, and is left the 3 purchased whiskies in return. And the costs are relatively low (£15 / meeting for what turns out to be all the whisky you can take on a school night), so not really worth it.
We did go for a philosophy - the Club aims to provide the means for Members to appreciate a greater range of whisky collectively than on an individual basis, and a motto - A Dram, No Drama (which kind of echoes the Glasgow ideal of relaxed company).
Hope it all works out for you!