There are too many ways to collect stamps to explain them all. If you have 100 collectors in a room they will probably all tell you 100 different ways. Many say that a stamps have no value. This is because it is very expensive to prepare stamps for sale and most of the money pays for preparation by the dealer. But, some stamps have value. Stay with the hobby and you will learn value. If you collect right, your collection will have a value, but a catalog and some education is needed to collect properly for investing.
A few words about condition
A nice clear cancel on a stamp is a good collectable stamp. Most will not collect a smudged cancel or a heavy cancel. A stamp that has no glue on the back and no cancel is not a good stamp to collect. These are called mint no glue. A hinge (the method a stamp collector uses to attach a stamp to the page) on a mint stamp (a stamp that has not gone through the mail) brings the value of the stamp down. You should not use hinges on mint stamps. Never use scotch tape near stamps. Use hinges.
The newest craze in stamp collecting is what we call topical collecting. A topic can be a dog, a cat, a boat or anything else, even a picture of the pope or a mountain. Other collectors actually pick a topic of the cancel that is used on a stamp.
Topicals also exist from very small countries that sell stamps with a cancel that are created for stamp collectors. These stamps never go through the mail. These stamps are called CTO's (Canceled to Order) and they have no real stamp value to stamp collectors. But they are fun to collect.
Zoom in on the country you want. I suggest you buy the biggest collection you can afford to, buy to start as buying volume will save you money. You might even be able to get the pages for the country and these are usually priced right, as pages have very little value. Then you can add with more material and can start saving up duplicates by country.
This is a very relaxing hobby good for many hours of fun. You will never run out of things to do and the cost is very reasonable. It can turn into an investment if you like but it does not have to be. The hobby gives something to think about that has no stress. Pick the area. Pick the amount you want to spend. And pick a way to collect. There is no wrong way to be a stamp collector.