but in the starting fellowship you aren't playing them, you're putting them on the table...does that meant that I don't have to add burden for smeagol if he is in my starting fellowship?
All companions in your starting fellowship are played
except your Ring-bearer who is "placed on the table". Therefore you always get "When you play" effects from starting companions except your ring-bearer, and twilight reductions etc.
Note that in the case of Sméagol,
BoGS, you have to add the burden if he is not your Ring-bearer, but you do NOT have to if he is your Ring-bearer.
Thranduil