For info on certain stock when you haven't got a trading account go to
http://www.asx.com.au
Generally to buy shares in any company you need to meet the minimum parcel of shares rule, which is generally understood to mean $500 worth of shares. You will then have to add brokerage fees on top of that (range from $19-$40 per trade) when you buy or sell anything so you need to take those into consideration when thinking about shares.
Your chances of making more than 5.25% depends on the way the company has performed in the year, there is no guarantee you will get a certain amount and your yield will depend on the price you bought at.
Say for example you bought 1000 shares at $1 each, that's $1000 outlay, the company gives a dividend of 5c a share so your 1000 shares will give you an income of $50 or 5%. Now that is not taking into consideration the franking credits that could apply. If you bought the shares at $2 a piece your yield would have dropped to 2.5%. if they had a rough patch and you bought the shares at 50cents each your yield would have been 10%. There are many variables when playing with shares and if you are unsure I would suggest reading some books on it before jumping in. I don't like recommending literature so just duck down to your local library and grab whatever you can find.
Also if you are interested there are a few websites where you can keep a virtual portfolio and see how you go at keeping up with the share news, how well you trade and see if you have the focus needed so you don't just decide after a few weeks it's too much and sell all of your shares at what could be a loss.
Please don't consider this concrete financial advice, it is just there for information and you should do a large amount of research yourself before deciding on any strategy relating to your money. If you find you do not want to do the research then you might be able to find other strategies that are less research intensive that might give you a good return.