From a what to collect point of view. In the US it seems that collecting is based mainly around getting sets of coins that fit into albums that are designed to hold one of every type of coin, one from each year and variety.
This may be the way you want to go forward. It is quite expensive I have found.
I personally collect one coin of a type, I forget about individual dates. With
US coins it can get a little complicated because the way the coin looks has changed even though it is technically the same coin.
But then as I have a big German collection, if I collected every date and mintmark, this would be impossible, I find it hard just to collect one of each type. I am not rich, in fact I might even be considered to be in poverty, (well maybe not), but I like having one of each coin from every country I can get.
I live in Europe and travel quite a lot, so I pick up the circulating coins from these countries. Circulating coins are much, much, MUCH cheaper than the older coins.
But then some people collect on coin from each "country" which gets tricky as you have to define country. Like German pre 1871 had hundreds of separate states, and countries come and countries go, then you have places that issue revolution coins that are used for only a few months and so on.
Then there are people who collect coins that look nice.
Each has its own merit. You do what makes you feel good, based on your budget, your reasons.
I started collecting because I lived in the US, and got a bag of coins, from
State Quarters (the first few) and then moved to the eurozone 5 months before the euro came out, and those two things got me going, and I just collected what I wanted to collect. And at the beginning I would say, go after the coins you want to go after. Do you want to collect circulating coins, or shiny uncirculated, proof etc etc.
Just follow your instinct.