On SCDigest, I wrote an article about the 5 models you should build in 2013. These are simple models meant to get you started and add value. Here is the list, but see the SCDigest article for more detail.
#1. Plot your demand on a map
#2. Add the current lanes you are using to serve your customers
#3. Reassign customer territories
#4. Model what would happen if you lost a warehouse
#5. Model a single product