Making sure content converts. Any tips?

I was going to create some instagram accounts and take some time to grow them with engaging followers and eventually introduce products and shoutouts.

I was wondering if there is specific type of content I should post on my accounts now to grab the right audience that will make it more successful to have conversions later or just go for good content?

Depends on the niche. Use CTA images like "what would you do..", "1,2,3 or 4?", "Ship or skip?", Etc. In that way you will build Active followers