I have found that when my 5.5 mo wants solids, there is no mistaking it. We have been on solids now about 2 weeks, and when nshe is interested, she opens her mouth wide, and fusses when I am not going fast enough. She is already showing definate preferences for some things, esp sweet potatoes mixed with apples or pears. There are other things she is not too keen on (green veggies, carrots). When she shows no interest, I try for a lttle while, then abandon it.
6 months seems a little on the young side to get a good "meal" out of finger foods- toast, soft carrots etc, however, if she can start to grasp and get the food in her mouth, go for it (but as you say, watch out for choking).
I really wouldn't sweat any of the details at this early stage. They are just learning about tastes and textures.