Nothing wrong with potting up or transplanting now.

I personally would not fertilize this time of year(at least not full strength)as it may
encourage leggy growth,unless you have all day sun from a g-house and warm temps.

Sometimes around this time of year but usually February,I like to start planning
this years layout of the yard.

I do a ton of plant related things in the winter. From watering all the plants to fighting pests on the plants, and pruning the plants. I also come up with all my ideas for next summer this time of the year! Usually those ideas dont always actually appear, but some do and they do make the yard a lot nicer! I also like to start the cannas around early March so when they go outside in late march or early april, I dont have to wait for them to sprout.
Good luck!
-Alex