First of all- you have come to the right place for support.

DS wanted to be held upright all the time to know what's going on in the family. The best thing I found was a Bumbo seat, which allowed him to sit without having the trunk support to do it. As long as a baby can hold their head up, the bumbo will do the rest. He was more content in the seat than on his tummy (although it's important to encourage tummy time also).

As far as toys, we did better with outings than anything else. At 6 months old DDs favorite places were zoos and natural history museums (still are). I would get toys for older children and they would hold interest better than at age toys. Also, books that were easier to hold, were an instant hit with both kids.

HTH

Jen