Hello James,
Welcome. To help us best respond to your questions, perhaps you could tell us what you are looking for. i.e. are you young and looking to start building a long term investment portfolio of what we usually describe as "buy and hold" stocks, e.g. the blue chip companies like the big banks, Woolworths, etc, or are you seeking quick turnover/profits from short term trading?
Also, are you looking for maximum capital growth, or a reliable source of income via dividends. You would choose your companies accordingly.
e.g. BHP might offer good prospects for an increase in its share price, but has a minimal dividend, about 1.3% from memory. Other stocks, e.g. infrastructure trusts etc will offer less opportunity for capital growth but give you a relatively high dividend.
I'd endorse the suggestion of your working your way through the ASX website's education section. There is all the basic information a new investor needs.
All the best
Julia