Welcome newbies.
Bcalvert1, quark is a free food, not an A choice, so you can have as much as you like, same with most fat free yoghurts. Your A choice should be milk or cheese from the list in your book. I don't drink milk, so have cheese every day. Your B choice is fibre, and it's things like bread, cereal, ryvita, nuts and some dried/stewed fruit. Again, read your book and get familiar with them.
It does take a while to get to grips with the diet, you'll get there though.
Becky, well done on your weight loss so far. Are you and your mum roughly the same weight and height? Everyone is different and arrives their weight different. I started SW with a friend, she weighed less than me, but now we weigh the same. She is a size 10 now, whereas I'm a 12/14 and she looks so much thinner despite being the same weight. Must admit I'm quite jealous and makes it harder for me. If you have a lot to lose, I had to lose 3 stone before people noticed, smaller clothes help people notice as well.
Regarding snacking, you can have 15 syns a day, don't be afraid to use them. Put a snack plate together with all your daily syns, and have that during the day. Make a plate for the night with free and synned foods. You don't have to limit what you eat if you're hungry, but you DNA change your habits. I don't eat after 7pm, which was hard at first, but had certainly helped.