Usually most of us get our first fills around 6 to 8 weeks after the op. Some surgeons put in a little saline in the band during the op but you will be told for definate if yours has after your surgery.
Usually restriction is felt when you eat dryer denser foods and around the size of your hand for a meal and feel full/satisfied on the small portion.
You are meant to feel satisfied after meals for a long time and not need to snack.
Usually you will be called back for regular appointments and fills by your provider, depending on how your loss is going and how much you can eat, you and your team can work out if a fill is needed at each appointment and how much to have.
Too tight bands are bad because then you have problems getting solid food down and may go into starvation mode or have to rely on sloppy / liquid meals.
Some providers get you to do the injections for a short while after surgery, but not all for band ops...so again, ask your own provider what they normally do.
Not at all stupid questions hun x I went private but had a letter to send to my doc informing him of the op to update my records.