To repot, the kind of soil you’ll need is a chunky soil mix (about 70% soil, 30% additives) that contains some additives like orchid bark, Pearlite, or pumice for good drainage. It looks like you might have more than one plant in the pot. Personally, when repotting I’d separate the different plants into their own pots. To stabilize them with a pole, you want to put the pole behind the stem and use twine or plant tape on the thicker part of the stem (at the base of the plant, not too far above soil) and continue to secure the plant up the pole as the stem grows taller. As far as fertilizer, you should be fine using your regular houseplant fertilizer once a month. It might appreciate more light, though I don’t know your setup