Is it possible to make it so everything on my site loads first and then the ads later because sometime ads don't show up and my site just freeze
You could put them at the bottom of the <body> tags in the html, but you'd have to surround it with a div, and style it so that it fits on the page elsewhere.
i usually put it in the center with the code <center> but then right now i am using a php script where i can actually get two pages together into one so i don't know.
One way would be to use javascript to put the ads into container DIV's or IFRAME's.... you could use a onload method to insert them after your page is done loading.