Well done on a successful first day, Trying hard.
As Barristagirls and SunnyB have said, measuring is fine, instead of weighing, but it further down your journey, it seems a shame not to know exactly how much you have lost, because it is very motivating, particularly when you hit a plateau (and you will) to be able to look back and see just how far you have come. I found this to be so, anyway, but each to his own.
Two meals a day is fine – I generally have a late breakfast (circa 11am) and an early supper (6pm), leaving a 17hour fast in between, and this has worked for me (I’m now in maintenance) and in fact, the fasting can have many positive benefits. Do a search on this site, there are lots of threads about it. Lots of people routinely do 16:8, so only eat within an 8 hour window, fasting for 16.
Well done on completing your first day and good luck tomorrow, and all subsequent days – don’t forget to drink the water..