I don't need tutorials right now, I will learn Encore after this project, but I seriously need help on what exactly to do. I have many questions and I thank everyone who helps. I have all the questions attached to the screenshot of what I need help with, thanks for all the help!
Your method is highly unorthodox, but I think maybe I can help.
Your audio problem may be a conforming or other issue with Encore Preview. Burn a DVD RW and test it in a player.
Your Check Project problems are multitude: You have too much data in the project to burn to disc, your two Main Feature timelines are not linked to by menu buttons or anything else, your slideshow is also not linked to by anything, and your menu has overlapping buttons.
There's no simple solution to these problems without you providing more detail.
How much video is in your project (duration)?
Are all of your buttons stacked on top of each other?
If you have slideshows and timelines, how are users supposed to get to them? You can either link to each from menu buttons, or set one of them to First Play, then link to the others by end actions. I assume you are choosing the former, since you have a menu.
The third problem is the same as the first. Burn a DVD RW and check it in a DVD player.
The fourth problem is the same as the second. Every timeline in your project will be written to the DVD. Your fourth screenshot shows that you have over 6 hours of timelines and slideshows. There is no way to fit this much onto a single DVD.
To solve your space issues - delete all timelines that are not being used. If you need them all, then you need to create multiple discs.
Finally, please accept this bit of advice in the spirit in which I am giving it (to be helpful): you really shouldn't dive into a project with a deadline if you don't understand how to use the application yet. This approach is doomed to failure.
Hopefully, you can work through your issues in time to meet your deadline. Answers to my questions above will be needed.