Hi and welcome to the forum. I think Gi / GL is a great way to lose weight as it will become effortless after a while.
Check out the threads in the Stickies section as there are lots of useful bits there.
When I was in weightloss mode on GL I did the following:
Avoided bread, potato, pasta and rice.
Replace these with rye crackers, oat cakes, quinoa, couscous , lentils or beans.
Keep portions very small: 50 g smoked salmon, 100 g White fish, 80g chicken or turkey.
Cut down red meat and replace with bean dishes.
Use a 9" plate for meals with 1/4 protein,1/4 starch, 1/2 leafy veg.
Drink plenty of water, 500 mls with breakfast, again at lunch and again at dinner.
Eat three meals and two very small snacks.
Start a diary here and post your food every day and any questions too.
Good luck