How long does the effect last if I naturally add volume with fillers?

Lately, whenever I look in the mirror, my cheeks look sunken compared to before, and my face feels a bit tired overall, so I am looking into volume treatments. I haven't lost a significant amount of weight, but when I take photos, the center of my face looks flat and there are shadowed areas, which is bothering me. I don't want a look that is obviously puffy, so I want to naturally fill in only the areas that are lacking, which is why I am considering a filler consultation.

I am curious if the required filler volume varies depending on the area and current volume level. I would also like to know what dosage is typically started for first-time patients, and whether the filler settles more naturally after some time has passed rather than immediately after the procedure. I am inquiring about the effectiveness, satisfaction levels, and average duration of the results, and I would also like to receive a consultation regarding pricing and the total cost.

I am also curious about the duration and level of pain associated with the filler procedure, and whether a recovery period is necessary due to swelling or bruising. I would like to know if I can go to work or wear makeup the next day if I get the treatment on a weekday, and what precautions I should take afterward. Since it is my first time, rather than going overboard, I would like to schedule an appointment after a consultation to get a natural look tailored to my face shape. Haha.