What should I do for my first charge with a Lithium-Ion Battery?

I’ve heard man different things from different people and I’m not so sure what to do. How do I make sure I keep a battery in good shape? I’m a little obsessed..

- You should charge it for 24 hours once you first get it before using it.

- You should completely drain it then fully charge it

- You shouldn’t completely drain it since it’s bad for the battery

- Drain the battery then charge it fully and wait an extra 2 hours

Ahh I don’t know what to do. I’ve had bad experiences in the past and now I’m a bit scared. Sorry if im a bit obsessed. Thanks in advance.

iPhones and iPods use lithium-ion batteries right?