I think you can get the colon working (and should) prior to working on the liver. Intestinal Formula #1 is the best. But make sure you are drinking half of your body weight in ounces of water every day.
A well rounded diet rich in fruits and veges. I also like the Vitalerbs product from Dr. Christopher at http://superfood.andmuchmore.com
throwing in some of his hot cayenne really can help as well.
Eating 3 prunes a day and a tablespoon of either coconut oil (also at the above site) or olive oil.
On the liver side - Dr. Schulze 's liver g/b formula along with his 5 day cleanse. I'd also get a good Milk Thistle extract like Gaia's and take that daily.