Flash, HTML,Static,Dynamic,PHP,ASP,... Well Which One?

My website is old, and its time to update? I am all at a lose, when it come to which type of website I need for my business,... ??? How do I choose which type,... Flash, HTMlL, Static, Dynamic,PHP, ASP,... can I use a blog for my business site? Do I need more that one? What should I spend,... the cost varies between all the advertisements in such a great volume,... FREE? $100, $200, $300,... $500,... $1000,... $5,000,... and yes even higher! What is the difference? Help!