A few herbal tips for prevention and treatment during the cold season is to take vitamin C , zinc, astragalus, echinacea, and goldenseal. Astragalus should not be taken if there is a fever or an acute infection. It also helps to limit your dairy intake. Dairy can increase mucus production and worsen congestion. I actually take cow milk out of our diet during the cold season to avoid feeling too mucusy. My daughter much prefers rice milk anyway.
If you do end up with a cold, REST REST REST. Drink your warm liquids, gargle with warm salt water, use a neti pot, blow your nose (don't sniffle it back up into your sinuses), inhale steam and/or take a steamy shower, use a mentholated salve under your nose (Badger's is awesome!), and use hot or cold compress around sinuses. I personally enjoy eating pho and making it spicy. The warm broth helps move mucus and the spice acts as a decongestant. Plus it's just comforting.
Good luck and keep those bodies strong!
Live well love much laugh often