I am currently 19, and I have had about a year of experience in stock investing/trading as well as reading some good books and internet articles.

What I want to know is, what investing/trading strategy should I be looking at for at least the first 5 years of my Stock Investing/trading career, or until I turn 24?

Investing for growth http://www.shareworld.co.uk/index.php/articles/notices/investing-for-growth/
This describes two different ideas for investment, and it is very brief outline, but it may give you an idea where to start.