I would talk to the people at the MS Society. Our local chapter has an amazing outreach person. She's always trying to find ways to get more people involved, make it easier for team captains, etc., etc. I'm sure they would be able to provide you with some information.
My inclination is to think that it could be as much or as little as you want. One year (and one year only), I did an employer based team with zero support money. Some teams to t-shirts, some do jerseys. If it's a 2 day ride - do you want jerseys for both days. Socks? MS rides usually have team villages - the company might already have a tent. Refreshments are nice. Training rides can be supported or not. If supported, it can be a water stop or dinner (or anything in between). Does the company plan to match donations? Make a donation itself? Sponsor a rest stop in the ride? Lots of ways to get involved.
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