How can I appropriately bring up topics of agenda to my professor in a meeting?
Send him/her an email reminder that you will be meeting and there are three things you want to discuss:


The week I will be taking off before the semester starts, what is expected before, during, and after?
When funding will be paid for _____.
The ______ project.


Have the email open and mention these "tag lines" if it gets off topic. Professors are usually busy, so I wouldn't beat around the bush with this. Just be direct and to the point, but cordial and understanding.

Whenever I do this before going into a meeting, even if we get off topic, we always tend to at least hit the email points before ending. It also makes it easier to talk about funding since it's much easier to do it via email, and now the email will force it to be a topic of conversation.