I am pionate about a career as a Technical Writing Expert in s/w MNCs. How do I start? What r the prospects

I did my PG in Computer Science but ever since worked as a senior faculty in the English Dept. of a leading Coaching Inst. offering quality tutorial services for competitive exams. Subsequently, I developed a strong pion for building a career in Technical Writing in Corporate MNCs (both s/w and HR) and I strongly believe that I possess the linguistic sine qua non which can place me at an entry level in the field. But I am keen on knowing how I can make a lucrative career for myself out of Technical writing and also the essential requirements for a long, productive working stint in this profession. I am basically looking for placement opportunities in the US. Kindly provide info along with useful job websites w.r.t. the above and a brief explanation of the Industry prospects of this profession. Thanq!