Getting A Poweredge 1950

Long story short, my father owns a commercial/industrial distribution company where I work as a broker between contractors and manufacturers.

Our current IT Department (who has no formal computer training) has become more useless to me over the past year and are turning my computer into a counterproductive experience which has about driven me off the deep end.

I am therefore deciding to do the unthinkable and break off of the companies server and start working through one of my own here at home.

Ill basically need the machine to act as a place that recieves and stores emails then distributes out to my machines (laptop, desktop)whatever is connected to it, store and access job files/information, and I would like to be able to hook up to my server at work to access a particular program they use on their server, i guess I could probably just install the program on my server too.

I would also like it for personal use and storage as well as possibly hosting my own website (personal website).

I am looking to get a Dell Poweredge 1950 with some solid specs (spend about 4500) to get me going and will be taking classes at the local CC to educate me on running this thing.

I have a few questions about servers in general.

1. Is it possible for me to connect to the current server at my company to exchange or access files/ programs?

2. Can I do this without compromising the security of the server at work? (security is their #1 argument against everything, they told me once that mozilla on my machine compromised the security of the system - BS)

3. Can I run Apples for my workstation and laptop and still interface with the VMware software?

4. I am currently on FIOS here at home, will I need a new dedicated internet line to run the server? what do I need for speed!??

Thanks guys!

I am still totally new to this whole server scene so I apologize if some of my questions are completely insignificant. I am trying to read around as much as possible but I want to get started on this so i thought i would try and get some direction.