ASP.NET 2.0 using C#, Search Engine for Website

Question

 Hi there, it's my first posting on this community.

 I have a project at work that requires a search engine feature. The challenge is this, my company is not willing to invest in a 3rd party SEO application. The only alternatives I can come up with is to download open source codes and build up from there, or create it from scratch. The search engine doesn't have to be visually appealing, as long as it works and is neat.

The search engine should fit a few requirements:

• Multiple keyword search.
• Database-driven + searching of static pages
• advance search options (nothing complicated, it's probably just a few more fields for refining the search.
• Standard features like paging, number of matches.
• It must be able search folders for documents that have names that match the keyword(s). Example, "download/Monday.doc", and the user enters a keyword, "mon". Something like that. And files, I mean file name of images, file name of any kind of documents, content within web pages, etc.
  

It's my first time building a search engine. Can anybody, kindly point me in the right direction? Are the reliable articles on the internet? Or books that might be helpful? I only have one weekend to gather the resources needed. Today is Friday, so by Monday, I will need to have at least 70 - 80% of the ideas ready. I'm also doing my part, so if I come across something good, I'll share it online and we can discuss about it.