Just start using it. Apple recommends that you fully charge it the first time you use it, not before you use it. They recommend that because Macs are typically shipped without a full charge on the battery. Even if you don't, nothing bad will happen.
Run on battery whenever you need to and plug it in whenever you can. You can plug or unplug any time you need to, regardless of the charged percentage, and you never need to completely drain your battery. Just make sure you don't run on AC power exclusively, as your battery needs to be used regularly to stay healthy.
The link below should answer most, if not all, of your battery/charging questions. If you haven't already done so, I highly recommend you take the time to read it.
You don't need to do that. Just use your Mac. You don't need to charge or drain to any particular level. Just use it.