I guess you already have your own trading account and you can get most of the information from there. There are also free share market info from finance.yahoo.com and other news internet websites (finance.news.com.au, afr.com).
Now about entering a trade , well you can use all those website and get the value for a company you are looking for or have a look at some of the techniques people use here in the forum so find one that suite you. (Charts, value investment, Divds ...)