Some gardeners love gardening a lot, but are quite willing to wait for Springtime planting season to start one.  For real self-sustaining gardening year round, you may want to think about using a greenhouse and getting into hydroponics as well.  There are table top hydroponic systems that will allow you to 'get your feet wet' with a new method.  There are also tabletop plant systems complete with lights.  You can have fresh herbs growing on your kitchen counter all year long.

You can keep a worm farm going all year indoors.  No, they do NOT smell.  Save up the vermicompost for the big Spring planting season.  Make worm tea for indoor/house plants.

You can study the seed catalogs.  Try something different this year.  If you grow a new veggie and you end up not liking it, you can always take it to your local food bank.

Plan your garden planting.  Rotate crops every year.  Do not plant tomatoes where potatoes have grown or near each other.   Use companion planting for all your garden plants to aid in pest control.  Draw it out on paper before you plant.  Keep in mind the N/S direction of rows and avoid plantings that will shade another row too much unless it is needed.