Typography is addictive. Choosing the right fonts for a project is a process that both agonizing and delicious…
I recommend you start with Google fonts. Super easy to implement. If you use Doobox Calligrapher or Stacks4Stacks Fontstack (free but do donate) then really there is nothing to it technically, just choose your googlefont, supply the font name, add in your text content and … that’s about it.
LetterPress is really nice too, but if you want to use Google fonts you need to add the font import line into your document head in order to make it available to the project. You still just supply the font name in the stack settings - it just doesn’t go off and pull it down from Google for you. No biggie.
Having said all of that you don’t actually need to use a stack at all. Nothing stopping you pulling the Google font down in your document head then using custom CSS to apply it to whichever elements you like. Those stacks just keep it simple for you.