• Write good copy for your content pages, Google loves great content as do all major search engines.
  
  
• Make sure all your text is spell and grammar checked
  
  
  
• Search Engines does not like too many flashes or pop ups and it distracts your customer
  
  
  
• Do not have too many images on each page and make sure they are the correct size so they load quickly.
  
  
  
• If you are aiming at an Affiliate based website check all your links on a regular basis
  
  
  
• Keyword research is a must!
  
  
  
• If you are planning to make your website work well with Adwords Pay Per Click or Adsense, Keywords Research shifts to number one priority. We can help you to set up Google accounts plus you can do your own Keyword Research with Keyword Analyzer by far the best I have come across.
  
  
• Make sure you have a form on your website to capture the customer’s details. Therefore building up your own database.
  
  
• Never use more than one exclamation point!
  
  
• Don't underline words if they're not links
  
  
• Make sure each page in your website has something valuable to offer.
  
  
  
• Make sure any external links you have open up in a separate page therefore not taking the customer away from your site.
  
  
  
• Make sure any affiliate links are cloaked so no-one can steal your commissions.
  
  
• Offer a FREE report on what you are promoting; get them to fill in an on-line form again building your list.
  
  
• Make sure your pages are linked to each other within the website
  
• Google like to see a Privacy Policy. You can obtain this Free Of Charge from www.website-law.co.uk/privacypolicy 

             you must keep the link to website law in the document 

See here for tips on Keyword Research        Pay Per Click Advertising