garry-chahal

Consider this: https://codex.www.ads-software.com/Moving_WordPress

Create another header template and simply call it from index.php whenever the condition is met(i.e. It is a home page)

Assign image the height and width according to your needs. By default image scrolls with your page

Create a new div in your header.php file with a css property float:left and place your logo to it.

Why not you create a new page going to pages->create new page, on your wordpress dashboard.

Yes it can be done by resizing the width of main div containing the code for that area.

It can be achieved by adding li tags under ul tag, in the code which generates the pages i.e. “wp-list pages()”

I can be achieved by altering the functionality of sidebar.php file in your installation

You can use any desired XHTML tags in any php file to alter its functionality

you can create the about us page by going to pages->new page. Then make your about us page your home page by going settings->reading

Ok. You can use float:left property in style.css and a div tag to place it where you want.

You can replace your header image with your logo image. To do it, go to your wordpress/wp-content/themes/yourtheme/images of your installation and place your image in images folder, and replace its name with your default header image . Doing this your header image (if there any) will disappear and your logo will come up.

Just upload and install your WordPress in https://www.yoursite.com/blog and don’t rename anything it will automatically pick up the index.php of WordPress installation showing up your blog.

Wooo!!
Ask your web host to upgrade the service(Mysql) or the best advice is to change the hosting provider

No problem you can have two wordpress installations on one web host like:
1- https://www.mysite.com
2- https://www.mysite.com/blog
Both directories can have wordpress installed, if you have already installed wordpress on https://www.mysite.com then you can setup your blog on https://www.mysite.com/blog directory
Wordpress MU is quite flexible to hold many installations on one host