Articles/Tenses in PowerPoint Presentations

I am sometimes confused about article/tense usage in powerpoint presentations. Specifically:

- Omitting articles
- Omitting articles for the first word in a title/bullet point
- Are simple tenses preferred?

I would appreciate if anyone could suggest some websites/books that deal with the topic.

Thanks a lot!

If you Google "Powerpoint style guidelines" you will get a lot of hits. Here is one random one I found:
PowerPoint Style Guidelines - American Marketing Association

Some institutions or companies will have their own in-house style guidelines.

I would say that omitting articles (unless they are vital to comprehension) is fine in order to save space.