learn a little bit about the market on the pcgs forum. once you start looking around people might mention a few reputable dealers and when they do, go for it. most of the cats on there know their stuff.
Collectors Universe Forums - Precious Metals
Kitco - Gold Precious Metals - Buy Gold Sell Gold, Silver, Platinum - Charts, Graphs, Prices, Quotes, Gold Stocks, Mining Stocks, bullion dealers
YouTube - GOLD VS DOLLAR
a good way to invest in precious metals is to buy steadily over time and don't try to "beat the market". this is especially sound if you are a beginner.
another school of thought will tell you that the worst time to buy is in a bad economy. this is when everyone is rushing to get gold. no one talks about precious medals when times are good. not a big deal since you aren't looking to get a large quantity at once.
i'd suggest gold bullion coins with no premium for their potential as a collectible. collector coin issues are usually a joke since the gold purity is never as good.
the canadian maple leaf is a great gold bullion coin. it is the purest in the world. US gold bullion is decent but there are tons of other options out there.