Leave it well alone for a while, to find out where the sun shines, where the water lies, where the shade is. Test the soil for its acidity levels, put in a few bulbs to cheer you in the Spring. Sit down with books, paper, neighbours, library books, the internet and decide over the winter what you really, really want. Get any hard landscaping you want done in the winter, keep the bulbs weeded and look forward to them. If the area has been gardened before it is even more important to wait a season or two to see what treasures, if any, there are - you don't want to grub out the one plant you have wanted for years and never knew was there. Addd a few tulip bulbs to the patch you've already done. You don't have to do it all at once, much more fun and pleasure to be got by doing things slowly by slowly, hopefully you have a long time there to get it as you want it - in time. Meantime, enjoy the planning, look at gardens in the area and see what they have doing well - still possible at this time of year. Don't panic, it will still be there next Spring. Do not rotovate, it spreads weeds over a huge area - lost an allotment like that!!