C# 2010 access a web service

Question

A work, I have just been assigned to consume a web service using C# 2010. The web service is suppose to give me a list of customer ids. I  need to obtain the list of customer ids by working with an .xsd file. (By look at the documentation for the xsd file, it looks like xml to me.) In addition from this web service, I obtain suppose to obtain files that I can download that are in word, pds, and tiff formats.

By the way, I know that I can connect to the web service since I have a command script, that can connect to ther web service. (The command script was written by the company that wrote the web service.)

Due to the requirements listed above, I am wondering if you can tell me the following:

1. How to connect a C# console, desktop, and/or web app to the web service?

2. How can I obtain the xsd file from the web service and transverse the xsd file to obtain the data I am looking for?

3. How can I download the word document, pdf, and/or tiff file from the web service?