Please need urgently help with some main issues

Hello,

I am building my first website and have big problems with some issues:

1.) Frontpage

– How can I change the teaser image? My new uploaded image doesn´t show.
– How can I remove the widget part (weekly specials) and instead put a video for that place? Or just add the video below?
– Why is the frame around the footer columns 1,2,3 full sized and not the same framed like the others?
– I have big problems with adding google maps. Please help

2.) Blog page (I named it “events”)
– I decided to have blog style 3, and in addition an event calender. My blogposts don´t show, neither the calender posts. What do I wrong?
– How to delete the frame above the post part, I have no slider activated.
– Where to manage the sidebar here?

3.) Food menu
– I decided to have 3 listed pages like in demo”dessert”
– THe prices dont appear, some titles are lost
– I would like to add for the second page just a picture as menu. Which template is the right one?
– How to change here the subheader color? I cannot find this option in Foot items.
– Where can I manage here the sidebar?

4.) Galleria
– I copied all the image URLs like in the page demo but the live view shows errors. Also the background is destroyed.
– In the gallaria I want to show pics of different events. Can I add more than one mini gallery in one page?
Where can I give each one a title?

I am very sorry for all the questions, I am sure that the most can be solved very quickly…if you know how. Please I need urgently help as I have a deadline. Cannot wait anymore.

Thank you in advance.
Katharina