What is the best way to start the plot in wet November?
... make hints to family and friends of all the tools, seeds and request appropriate gift vouchers for the coming festivities
Take lots of photos of said plot from all angles - the BEFORE photos so you'll see progress as the months progress and especially a year from now
Make a brew, lean back and draw plans of where to put things.
I've deliberately avoided the outdoor activities as it is a little difficult to advise at this time of year - if the plot is anything like mine, the soil has been bordering on saturation but at least I have raised beds and footpaths so won't be trampling down the soil. If you can get a fork into the ground without lifting up heavy clods, you might be able to start clearing some of the weeds but I'm sure someone will be along to advise you better