I am looking for a reference book that details everything I must keep in mind while writing scientific and technical documents. It should include both practical advice, do's and dont's as well as standard style information.
Well I am not sure if there is a reference book that will tell you everything but there are quite a few guides around that should cover most of it. Here are a list of few books (not really following any referencing standard here):
Apart from these, there are several guides written by faculties at various Universities. They might be suited for some but not all purposes.
Also consider looking for the UN guides. They contain some very good content.
Hope some of this helps.