1st - find out what eye dominance you and your daughter are, if you're left eye dominate, shoot a left handed bow.
3rd - Measure your pull length and weight and then find the correct arrow weight, length and stiffness.
Goto www.pinwheelsoftware.com and download a FREE one month trial for the Arrow Selector software.
archerytalk.com is a good place for questions.
4th order some arrows to your draw weight and length and also some for your daughter at her draw length and weight.
5th - setup a safe range with a good backstop. Arrows fly everywhere at first.
6th - look at youtube videos.
7th - Look up and see if you have a JOAD group in your area. My daughters love to shoot there.
A 4 year old will have a tough time with anything over #16 lbs. I think a Samick Little Fox 48" with #10 limbs would be great for them.
High end for you to start with I'd get a Samick Polaris 66in with #22lb limbs to start with.
Again, get arrows that are custom to your bows for the weight, stiffness and length and you'll have much more success.