Well,
I'd go with Andrew on getting plants. Some websites on the net selling carnivorous plants sell small plants at least in my experience (I'm not going to say who).
Why not grow outside? I live in Wisconsin too, my friend, and I grow about 10 Sarracenia which are thriving outside all day long in direct sunshine. All they need is a pot, peat moss and perlite or whatever combination you feel like doing, a tray of DISTILLED or REVERSE OSMOSIS water they are standing in, in a good sunny position and they are set to go, you just have to keep refilling the water tray. It can get more technical when the pests come... but, I won't get into that.
A big plant with nice colors is S. leucophylla, but, that depends if you like lots of white and red
.
Soil fertilizer = Sarracenia leucophylla var. dead pile of mush
Just grow outside. You are enthusiastic now, but, taking a plant in and out of your house day by day will make you not like doing it. S. psittacina and S. purpurea can be grown under lights in the house, as well as young Sarracenia, but, then you'll find S. purpurea and S. psittacina are the two smallest Sarracenia, but, the large, beautiful ones can only be grown outside. Even a windowsill isn't good because it would have to be incredibly tall to house an adult Sarracenia, adults have the most beauty you know, plus, it's harder to get insects in a windowsill.
I grow in Wisconsin too, I recommend
www.Sarracenia.com as a starter in the FAQ and read about Sarracenia. It's actually nice to see someone just starting asking about other carnivorous plant species and not just Venus Flytraps
.
For pot sizes:
3-4 inch pot is good for a plant only about 6-12 inches tall in my experience
A 5 inch pot is good for a lot larger plants, from 12-24 or so inches depending on the root system (Sarracenia aren't picky on root space, but, they do need some, my Sarracenia with 20+ inch pitchers do great in 5 inch pots)
6+ Inches is good for any plant with multiple growth points, clumping, or just huge in the case of S. leucophylla 'titan' which has been known to reach 3 feet tall, and sometimes even over 40 inches!
Leave it to the professionals though, I did what I can to help, especially since I saw you lived in Wisconsin.
P.S. Most Sarracenia, except S. purpurea
ssp.purpurea NOT venosa cannot grow in our climate since during winter it is so freezing. However, some Drosera like D. intermedia, D. rotundifolia and Pinguicula like P. macroceras and P. vulgaris can grow up here too, but, only S. purpurea
ssp. purpurea can grow here out of the Sarracenia.