Hi Jiffymouse,
Your dracaena tricolor is really pretty. This site has general care info for the species you have, but not the exact same variety.

http://www.evergrowing.com/HousePlantTV/dracaena.htm
http://63.170.252.43/Marginata.asp

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...it has 2 "branches" coming from the main trunk and then there are 2 very new shoots coming from the main trunk lower down. can this plant be split up?

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You could split it up, but I would wait until the new shoots are about 6" tall before I do that. These plants often look nice with several stalks in one pot, so you may decide not to. If you do, you will discover that the new shoots grow from the mother and are attached by an underground runner. It takes them some time to get mature enough to have enough roots to sustain themselves.

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...dracaena "janet craig"...I cut it into sections, and put the top into a pot to root. (did the whole plastic bag over it thing). about how long before it roots?

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It could take six months before it develops a strong root system. Take a look here at some helpful tips on propagation of houseplants.

http://www.cce.cornell.edu/suffolk/grownet/indoor-plants/propagation.htm

For question #3 on how long to see new growth, the plants will need to establish a root system before they are strong enough to support new growth. Here's some interesting info on your 'Janet Craig'.

http://www.evergrowing.com/HousePlantTV/janetcraig.htm
http://www.plant-care.com/PlantTips/1998/091898.htm

Hope this helps,
Newt

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When weeding, the best way to make sure you are removing a weed and not a valuable plant is to pull on it. If it comes out of the ground easily, it is a valuable plant.