My tips may mirror others...
Get a black cloth or wooden box to contain them. Get a crystal, clean it, put it in the box or cloth with them. Cleanse them with incense.
Buy a book. As you read through it and learn about the different cards, stop after reading about each card, pick up that card, and see what you see in it. Write in a notebook your reflections as well as the books descriptions, but in your own words, about that card. Move on to the next. It will take several days to get through this. Don't overload your brain.
Everyday, shuffle through them. Do this at a time when you haven't just eaten and aren't really tired or stressed. Infuse them with your personal energy.
Sleep with them under your pillow. Your dreams will be more welcoming to divination.
Don't allow anyone to touch them while you are getting to know your cards except for you.
Begin with readings just for yourself. When you do begin to read for others, don't judge the answer. Just because it doesn't make sense to you doesn't mean it won't for the person you are reading for.