Web server Transactions from VB

I require a help from u.I am not that good in the web side so I am asking ur help.I will state my requirement first and then I will tell my problem, U please suggest me a solution.The requirement
is that
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The project that I do now is going to be implemented in three places and the same time one Head office and the other two are sub-offices.So I need to have data transactions between these three.I want to use a web server space for that.
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Now the problem is that
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I dont know much about web servers tell me that first.Then I need to know the safest way to do these transactions that is Uploading to the Web Servers from Sub offices and downloading from the web server at Head office and Viceaversa.Also how safe is this method and which is the safest method.Links to usefull sites will be appreciated

I dont know why no nody turns up here

U have to only upload the files on the server and then download from offices places. Or anything else.

Is it safe to just uplad and down load as it is

yes, no problem

download files in binary form

See this is not just any simple data.This data should not reach to any one else.I have heard that these transactions are done very securly since in the transfer time there is great possibility of misuse any idea

It is possible, u can encrypt the data in file using some encryption algorithms like md5 and when u download decrypt it. This is the way i know, if u find some better solution tell me.

Any way thanks a lot for the suggetions Bye