I want to use Ubuntu for developing my application - pl help

I want to use Ubuntu for developing my application - pl help

I am an Mfg Engg Professional with 30 years experience in CNC / CAD / CAM
fields. I have stumbled upon an application for time & motion study and
using VB.net SQL 2005 Express developed it into a full fledged app - with
visual studio.
I am hearing the word that Ubuntu is a good system. Pl tell me if I can
use it as a development plat form for my app development - to make it as a
true open source one - preferably using the same .net, vb etc
technologies.
I am a developer with VB due to its easy visibility of books plus training
courses for the same. I am not very much conversant with 'open source'
though I feel it is a good thing..
Can some one help me with some suggestions? Will it help me 'stay afloat'
with some kind of revenue flow - even though my app will become an open
source ? If so, how?
Pl reply.
Rgds
Renga Iyengar Chennai India