Static web sites will have to be full with content to be able to capture the attention of the visitor. When you decide you need more than that, you need a tool, a program, instead. At this point you need a web developer.
PHP is the main programming language used by Facebook and Wikipedia, among others, to make the web business viable. It is cheap to develop on and very robust and reliable. The developer will work on a site like an engineer or an architect would do when building a house: a project must be created, a model of how it is going to look like must be designed and a budget allocated.
Reliable systems will have last over 20 years and cost something like £50 thousand. For good automation engines with long terms support you need to work with good developerd or web development companies.
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