Ask HN: How to get started with Spaced Repetition Systems (e.g. Anki)

I want to start including SRS practice into my daily routine.

What is: * the best way to start? * the best way to _keep up with it_?

Should I care about existing decks or focus more on deck creation UX of tools?

How much time should I allocate to practice and card creation to do well months or years from now?

Note: I've kept this question intentionally vague for broad applicability.