In your area, swingerzonecentral is more popular. We live in nwi and travel indy regularly, so we are on both sls and szc, using sls up here and szc anywhere to the south. The most important aspect of online swinging is to use one that everyone in your area uses, hands down. For you, that is szc in our experience.
As far as advice... pay for the membership... it is peanuts compared to what it costs to live the lifestyle (parties, travel, clubs, outfits, dates...) and the value you get out of it is worth it. Think of what you invest in having a great marriage, and this is an investment in expanding your life together. Btw, we, and most others, ignore free profiles as it shows they may not be commited and a risk for not showing up or newbie drama. Pay for a month, work your spouse to write a good profile, and learn how to use all the features. When they have a sale, get a lifetime membership, they are a great value. With Craigslist shut down, these sites are the best online option currently for online matching.
Fyi, Shenanigans in anderson is our favorite club in your area, check it out if you get a chance.