Ok first, welomce.
Now we need to know how big your tank is and how your cycling it? What are your current test kit readings? Ammonia? Nitrite? Nitrate? Once you've got your rock how you like it you don't need ore unless you dont have enough. 1.5-2lbs per gallon is enough rock.
What kind of lights do you have? You can't keep some corals unless you have good lights. Also please don't buy an anenome. They are very delicate and often perish in captivity. If you absolutely have to have one, wait for a year so your tank is mature and sudden swings in nitrate, pH etc don't happen anymore. Clowns don't need an anenome either if you want to get clown fish.
Plants that you add are Macro Algaes, they absorb excess nutrients. You put these in a refugium that is a seperate tank plumbed to your main tank. As for species, are you talking fish, coral or macro algae? Also we can't give you an answer until we know your tank size and lighting.
Also, where abouts are you in Australia?