Welcome to Numista!!!
As said before, yours is the decision on what or how to collect and sort.
If you want to collect all coins on the world, I would suggest to slow down, and make a more wise choice, you can see Numista is reaching 150,000 different coins (and still growing), on those coins you also have different years and variants, mintmarks, privy marks.... that would be too much, I guess. At least I started on that way, and soon I narrowed my target to make it more realistic.
A classic start is own country, depending on where you live, you can find many coins in spare change, and then find older ones in coin shops, or via swaps. If you know people who travel, ask them to keep spare change to you, there will be many new coins, and also many doubles to swap.
When you have many coins in your first choice, and is turning harder to find new ones, you can expand your target. Say, you started with your country, then maybe is time to add some neighbor countries.
Or you can choose to collect by themes; here is a thread with
loads of interesting themes.
Depending on what you choose to collect, will be the sorting method. The most usual, is by country, then denomination, then year. Myself, I have sorted in different ways, and often have changed the sorting, as I thought other system is better. Anyways, is a good opportunity to check your collection and look again, and enjoy your coins, and of course to fix mistakes.
About determining condition of coins, it takes time to train yourself, but you can start with
this thread, in Numisdoc (I also suggest you to click "Numisdoc" tab and have a read of its contents, you can find many interesting articles there.
Hope to hear from you often, Happy collecting!!!
Just 10 options: you understand binary, or you don't.
Catalog Referee Coins, Banknotes & Exonumia: Uruguay, Cuba, Bolivia, Brazil, Chile, Colombia, Mexico, Peru, Paraguay, Costa Rica, Venezuela, Panama, Ecuador, Zamunda, Parva Domus and more.