LinkedIn Ad-->> Offer (MUST READ Report) -->> Opt-In -->> Nurture Lead -->> Get Inbound Response -->> Convert sale.

If you have an audience, start a group and share daily, a mixture of shared and self created content. Use the weekly email announcement to sell.

I'm testing out "for group members only" type of content offerings, it works well if you already have a traffic source - which in your case can be other groups.

My reasoning was I wanted to control who sees and is ultimately able to profit from the value I offer.

You can also pre screen (not admit) folks you perceive as being broke.

Funneling them to your group makes it easier for you to cultivate a list of targeted DM leads.

LinkedIn groups (open) also rank well for long tail.

Finally, running ads to your own group makes sense.

Oh and have some good reviews!