I'm really sorry to hear that happened to you. I promise you it's not typical. Leaders are human, and unfortunately sometimes that means honest mistakes happen from time to time.
Did they ask you to stay afterwards? Usually there's a mini-class after the meetings for those who are brand new to WW.
I'm rather surprised that you didn't get what you need at the very beginning from whoever weighed you in. Usually you get a nice packet with all sorts of useful information.
Here's what I suggest: If at all possible, get to a second meeting
this week. WW Weeks extend from Sunday - Saturday, so getting there this week would involve going to a meeting before Sunday. You already paid for this week, so you will NOT have to pay for a second meeting. (As long as you remember to bring proof of your membership.)
Just ask for the leader and explain the situation, and show her/him the materials you were given. They should be able to give you the info you need. Then, at the very least, you'll have the materials. You can then choose to sit after the class and have the leader explain the program (as should have happened).
If you're absolutely unable to get into a meeting until next week, then you'll just have to wait for the rest of the materials.
In the meantime... Track to the best of your ability. Don't stress about the Points or any other part of the program if you don't have the materials. Just start by training yourself to write down all the food you eat. Honestly, tracking is the biggest part, and if you can begin reminding yourself to write it down, then you're going to have an advantage when you are able to get those materials in hand.
Sorry to hear that the start of the program had a hiccup. You'll get what you need as soon as possible, and be well on your way to eating heatlhier

Welcome to WW!