What to do:

if using Saniderm (a clear adhesive wrap) keep it on for at least 24 hours and up to 6 days. If there is a lot of liquid pooling up under the bandage, remove it and optionally put a second piece of saniderm on (a little bit of ink pooling under the saniderm is normal.) If your tattoo is becoming increasingly uncomfortable or the saniderm is bothering you, remove it.
For larger wrap around pieces, saniderm can be uncomfortable to remove, In which case I recommend removing it in a warm shower. After removing the saniderm, WASH and dry with a clean paper towel, then Wash twice a day with warm water and a mild fragrance-free liquid soap (I prefer diluted liquid dr bronners unscented baby soap) and apply a very thin layer of mild unscented moisturizer (such as lubriderm) twice a day until the tattoo is healed.  

It is normal for your tattoo to look desaturated after removing the saniderm!

After the tattoo is completely healed, always use a high SPF sunscreen on your tattoo when in the sun

if using a Traditional bandage (a pad and tape): Keep your bandage on for 2-4 hours. It can be left on overnight.                     

Wash your hands with antibacterial soap before cleaning or touching your tattoo.
After removing your bandage, rinse tattoo with warm water and dry with a clean paper towel.
Wash twice a day with warm water and a mild fragrance-free liquid soap, then apply a very thin layer of ointment (Aquaphor or A&D Ointment) for the first 2-3 days.  
After the first 2-3 days, switch to a mild unscented lotion (such as Lubriderm)  After the tattoo is completely healed, always use a high SPF sunscreen on your tattoo when in the sun. 

What not to do:

Do not use lotions with fragrances or aloe.
Use freshly washed bed sheets and clothing during the healing process, If your tattoo sticks to your clothing or sheets, do not rip it off, use warm water to remove it. 
Do not scratch or pick. For the first two weeks. Limit sun exposure as much as possible. Avoid tanning beds for at least a month.
Do not submerge the tattoo in water for the first month.
Avoid heavy sweating in the area of your tattoo for two weeks. Wash after excessive sweating.

Most tattoos should be completely healed in 3 weeks to a month. If you have any questions about aftercare, don't hesitate to email me : madstartattoo@Gmail.com