Pages must be simple in design. HTML 1.0, non-commerical sites are preferred.
Pages should not use much scripts/css for cosmetic effect. Some might squeak through.
Don't use ads that are intrusive (such as ads that appear overtop of content).
If your page does not contain much text, ensure your meta description tags are filled out.
If you submit a blog, submit 1 or 2 of your articles, not your main feed.
Only the page you submit will be crawled.
If you have never built a website, here is an example of a perfect one to learn from.