i think the first thing you need to do is find out if there is a market for this type of thing

i must admit i know nothing about drugs or the line of work you are in, so i'm not going to pretend to

by the sounds of it you want to offer a consultancy type service? if so then you need to be targeting medium/big companies. perhaps speak to HR departments in these companies, i'm sure they must take provisions for this sort of thing.

i would get some government facts and figures (about misuse of drugs) and maybe do an introduction letter to you and your services and send them to companies. It may even be worth your while advising such companies of how to communicate this to there employees, e.g anonymously and act as the mediator between the employee and the company. blah blah blah, you get the idea

there will lots of advise on the internet, but i know people like natwest offer a small business advisor (some info here http://www.natwest.com/business/busi...d/default.ashx )

never written a business plan so cant help there, but there will be some templates you can follow to help