Hi! I joined yesterday, so also very new! I've been doing SW on and off for the past few years, but managed to lose a stone and half last year. The last 6 months I've yo-yo'd between 5 or so pounds, so have decided enough is enough, I will hit my target! I always weigh-in on a wednesday, so I definitely think you've picked the best day- furthest away from the weekend where a few extra syns seem to magically appear!
Do you have a target in mind, or just taking it slowly to start with? Have you done Slimming World before, its the easiest one in my opinion, you can eat so much, its great! Anyway good look tomorrow, and if you need any SW tips I'd be happy to help.
-K