I applaud your efforts to try and sell you home by yourself although I think you may be doing yourself a disservice. You are correct that you want your house to be listed on the MLS as this is the authoritative source that real estate professional use to list, find and EVALUATE properties. I emphasize the word EVALUATE because it is one of the key benefits of using a license agent for your transaction. An agent will help you price your home correctly, market your home, advise you on best practices for getting your home ready to sell, consult with you on the local market and what to expect and stay on top of any offers, contracts, inspections and contingencies to make sure the transaction comes to completion. A lot to tackle even for agents with many years of experience let alone someone with relatively little experience doing so. Yes, there is a fee that comes with this service but I am sure that it will save you money and grief in the long run. The last thing you want to do is overprice your property and watch it sit, or get in the constant cycle of price reductions while you chase the market down. (If it continues down). If you underprice your home it could end up costing you thousands.
So the answer is yes you are correct and need to be on MLS and you get that by working with an agent... along with a whole lot more.
Hope that helps,