Feeding New Goldfish

Okay, so the stroe guy said to let them settle down before feeding them. I
bought a small tub of little food sticks (they look mroe like pellets to me)
to try them on, which the guy said would probably be ebst. he also emntioned
getting'treat' food's for them to use on occasion.

i read somewhere that i should soak the food sticks first to prevent them
form swelling up after the fish has eaten them. another site suggested doing
this and then squeezing the water/air out so the pellets would sink. Is
eitehr of these correct?

I've looked about and found tubeworms, bloodworms, freeze dried bloodworms
and all sorts of stuff. what is most suitable/most successful?

i spose i can try different things and see what the fish likes the most.

Also, just a quick note, is there anything i should look for in the fish's
behaviour. I just want to avoid panicking or worrying fi the fish eitehr
feeds then quietens down, feeds then livens up or anything like that.

thanks again
Adam