Welcome to the site Vivenne, congrats on your new lotty and hope you feel better soon!
![biggrin :D](https://chat.allotment-garden.org/Smileys/green/biggrin.gif)
I'm going to move your post over to the Grow Your Own forum for people to see your questions better.
First thing I'd suggest you do is to click your username and edit your forum profile to show your general location, so we can tailor future comments to your location
![happy :)](https://chat.allotment-garden.org/Smileys/green/smile.gif)
There's quite a few source of information on here.
If you click the Growing Help link just underneath the main banner, you'll find some allotment articles including clearing and planning your plot. There are also articles on what to do month by month.
http://www.allotment-garden.org/vegetable/general/sowing-harvest-vegetable-chart.php is a chart which shows what can be sowed and harvested when.
TheGYO forum has quite a few threads about what can be done now too.
If you do a forum search for Christmas potatoes, you'll find a mixture of stories - but generally the outcome is not great. You will need an early variety, which you plant next month. Seed tubers are expensive and they run the risk of being killed by frost. Your best realistic chance of such spuds is to grow them in pots which you can bring under cover when frost is forecast.
There's also the history of the site, in that freshly cleared grassland often has wireworms in it, which lurve potatoes!
I'd take it slowly, take lots of photos, get something in so you can see it growing, and plan for next year. If you clear a bit, try to put weed suppressant or cardboard (not carpet) down to stop the weeds coming back before you're ready for them.
And enjoy!