Beginner Gardening: what should i do with these?, 1 by Hica

Hica wrote:
We received a large planter in August for a gift. It has Braveheart Begonias, a coleus, and it seems one of my kids took the tag identifying the third flower. Now, I'm stumped as to what care it will need over the winter. I know it has to be brought in, I've already done that. Begonias I've only tried outside, and they died before the summer was out, and I never tried again to figure out what i did wrong. Coleus I've only planted outside and just leave them to die off in the fall. The third plant I'll post a separate picture of here and in the plant identification forum and maybe someone will know what it is and what care it needs. Will the coleus die off over the winter, or since I brought the planter in will it still be around in the spring? And when should I think about repotting? You can see how full the planter looks, but most of it is leaves and long stem rather than stems taking up space in the pot. There's actually a good amount of space between the plants at this time. I can search here and on the web to find out how to take care of the begonias, but advice from someone is always better than reading the bare facts imo ;)

So, any advice would be welcome!! I really want these flowers to last, since they were given to us when my father in law passed away, but I've never tried houseplants, even though I spend most of my spring and summer planting and digging new beds outside.