What Should I Collect?

Intresting question. My simple answer is- collect what pleases you.
Many folks do not realize how many different and intresting aspects of coin collecting can lead you to all sorts of wonderful experiances. You might decide to collect a topic or go topical. This would mean that you choose a particular subject, let's say, presidents. You would therefore collect coins that depict only presidents. You might want to pick your own country or another country or both, or even all presidents worldwide.
Or you may twant to pick a metal, say silver, gold, or copper and collect only those coins which include only that metal composition. Or maybe animals on coins, flowers,flags, maps, etc. The list goes on and on.
One thing for sure is, there iare plenty of chices out there to get started. However, if you do decide to pick a topic, there may not be an album or folder in which to cllect these coins. You would then want to buy pages in which to store them, a 3 ring binder in which to store the pages and 2x2 holders in which to store the individual coins, thereby making your own album.
A rule of thumb when just starting, though, is to collect what you enjoy looking at, what pleases you and is appealing to you to look at. Listen to your heart and follow through.
Collecting foreign coins topically is very inexpensive. You will not likely ever sell your beginners collection for a profit somewhere down the line but oh, the fun you will have.
Or you can collect the good ole USA. Lot's of choices starting with the easiest, the Lincoln cent. It's been around since 1909. or the Jefferson nickel which has been around since 1938. And the Roosevelt dime, around since 1948, and the list goes on-Washington quarter-1932, Kennedy half-1963, etc.
Many trade magazines, Numismatic News and Coin Worl can set you in the right direction. There are lot's of ads in the back of these newspapers, catogorized to make searching simple. Write to a few of the dealers who's ads are listed, send for their catalogs and develop a relationship with them. You may be surprised at how friendly and helpful they will be.