1). I lost 16 lbs the entire first MONTH, and I went on to lose over 200 lbs. Most of us seem to lose somewhere in the 15-25 lb range the first month (yes - MONTH). So unless you're an outlier or the size of someone on "My 600 lb Life", you are doing very well!
2). sounds like you are experiencing the infamous "Three-week stall" right now - right on time, too! The vast majority of us hit our first major stall within the first month or so after surgery - and it's usually the third week;, hence, the name. If you google the site for the three-week stall, you will find something like 17,000 posts on it (and no, I am NOT kidding). A slight bump-up in weight is not unusual, either. It's almost certainly just water weight. The best thing to do is to continue to stick to your program and stay off the scale for a few days. As long as you remain compliant with your program, the stall will break and you'll be on your way again. It usually takes 1-3 weeks.
3). you won't feel much (if any) restriction or "full" until you move to solid foods. Liquids go right through you, and purees pass through pretty quickly, too. Plus you had nerves cut during surgery, and it takes awhile for them to start to regenerate. You'll feel it fairly soon. However, "full" doesn't always feel the same way for many of us that it did before surgery. I don't feel "full" the same way at all - it's more a discomfort - sort of like pressure - in my chest. Once I start feeling that, I know I'd better stop eating or I'm going to be sorry. Others have even weirder full signals - like a runny nose or sneezing.