In most parts of the country "Christmas Season" is followed very quickly by "Cookie Season" and the leader facebook groups are filled with questions and complaints from leaders old and new. As noted in my profile, I've been a Girl Scout leader for over 15 years and this post is an attempt to share the things I've learned with others. However, the first piece of advice I have is to make friends with your Service Unit Cookie Chair. She is the one who should know the rules in your council, and also what you can expect where you are.
Learn Your Council's Rules
No councils, that I know of, allow girls to take the money earned by selling cookies and put it in their own pockets. Most do not allow much if any differentiation between how the troop rewards low sellers vs high sellers at the Daisy and Brownie levels. For older girls, council rules are all over the map as to how they allow cookie proceeds to be used and tracked on a per girl basis. Some allow (or at least turn a blind eye toward) "girl accounts" where each girl's proceeds are tracked and allocated for her use for Girl Scout programming; others strictly enforce "troop money is for all the girls". Knowing your council's rules on this is important when you get ready for the next step: Talking to Parents