There is no good answer for this and it depends on when your baby is able to sit up right in the high chair and has the motor skills to reach and grab their food. Sometime after 6 months. Also, be super careful on the size and texture of the food. I recommend starting with something super mushy and letting them make a mess! More may land on floor then in his mouth but its all a work in progress!
My baby is super picky with texture. Hopefully you won't have this and your baby is excited to eat but Brent was never open for trying new things. The only way I could get him to eat was by letting him do it himself; at his own pace. He learned to try new things and even though he may not like something.. at least he would try it if I let him do it on his own.
I still battle with this and he's almost 1. But I do a combo of letting him feed himself and trying to spoon feed him when possible. I think the more you try and the more you let baby lead, the happier and less stressed both of you will be!
Good luck and whats your take?