Here is a very warm Aussie Welcome to the CCF ....

Your questions only raises more questions....sorry.
Before you go out on a spending spree you will need to ask yourself a few questions.
What do you want to achieve out of this collection, is it for sheer enjoyment where capital appreciation is secondary or is it strictly investment where capital appreciation is the desired objective of the whole collection.
What sort of coins do you wish to look at, circulating or non circulating legal tender.
What face value denominations are you interested in.
What sort of metal are you interested in, gold or silver.
Most important of all, what sort of a budget you have planned to spend in your collection.
When you are in the position to answer all of the aforementioned, there are members here who will be more than happy to offer you advice for your further consideration.