About the tattoo aftercare: listen to everything your tattoo artist says. A different tattoo artist may say different things.
I'm only giving you the basic tips:
Wash your tattoo with water and ph neutral soap, at least two times a day (times may vary, it depends on the artist).
Don't spend much time on the bath nor under hot water.
When you're tattoo start to scab, don't pull it because some ink may come attached.
And I think that's all.