Two tips, one I read on here and the other from me: "Clear" fiber you mix with liquid--water! (I found a natural one, 10 cals per serving); fools you for a bit into thinking you ate something, and it prevents the constipation some experience. Broth: As a vegetarian, I use veggie broth; and since it's very low cal, I usually add a tiny bit of coconut oil, only 5 cals but helps with satiety.
I know at first it feels a little scary not to eat (much), but once you find your rhythm, it's very doable! Good luck and welcome!