You've already received excellent advice on storage, so I would offer two other important suggestions for a beginning Numismatist.
The first is simple. Never buy a Coin unless YOU love it. Don't buy coins you will need to upgrade. Don't buy cheap coins because there is a reason they are cheap 98% of the time. If you see a Coin and your first impression is WOW, buy it if you can afford it.
Although I often catch flak for my second suggestion, it's important enough to face such arrows. The difference between a Numismatist and an accumulator is an active want list. Although it may take some time to find individual fields that you find fascinating, eventually you will find yourself settling on areas of particular interest.
I advise a want list of between 50-70 items. That way you always have something to search for and you will gain considerable knowledge about those items. Try to have a range of prices between easy and the highest at an entire months spending. That way you are buying a few coins each month.
No one else's suggestions, including mine, will likely be how you eventually end up collecting. But remember better quality coins will always be easy to sell while junk will always be junk.