Creating and Searching index files

Hi,
This is my first posting so apologiese in advance if it is difficult to understand.
Firstly, I am from a development background of some 6 years (c#, asp.net, vb.net, SQL) so i have a solid grounding and am happy to give any new development a try.
I have a client who has 10,000's of scanned pdf documents but no real way of retrieving and searching these documents. In fact another person in my team is involved in making sure these pdfs are searchable by doing some OCR and rescanning work. I have been asked to come up with a way to allow client to retrieve(open) and search the pdf files.
Here is what i am proposing based on what I have leared about Acrobat Pro 9 and Adobe Reader 8/9.
I actually want to do a lot more than above but think that is enough to get me started. In a nutshell the client would like a web based solution to search and retrieve (open) there scanned pdf documents. I have read on other posts in the forum an understand it can be quite difficult to search pdf's (pdx file) from Internet Explorer.
As a start i had the following tasks in mind as needing completed:
Task 1 - Create directory structure on file server for all the scanned pdfs. Create catalog(s) for these documents and then create an index which creates a .pdx file. Given the number of documents it looks like I will have X number of catalogs and X number of pdx files.
Task 2 - create a web application that allows a tree view to be displayed that replicates the directory structure above so a user can open the pdf from the browser.
Task 3 - I know the users can use Adobe Reader advanced find functionality and select the indexes i have created. However, I would like to create a plugin for Adobe Reader that will load all of the indexes into the selectable index list and select all by default. Given the volume of documents it is likely the user will not know exactly what they are looking for so will need to search across all indexes.
Thanks in advance for any help anyone can provide me in getting started with these tasks.

Some links that may be helpful.
Acrobat Developer Center:
http://www.adobe.com/devnet/acrobat.html
Forums:
Acrobat SDK
http://forums.adobe.com/community/acrobat/acrobat_sdk
Acrobat Scripting
http://forums.adobe.com/community/acrobat/acrobat_scripting
Various topic specific forums at the AUC
http://acrobatusers.com/forum
Be well...

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