Reddit mentions of Daisy 994998-403 Outdoor Products Youth Lever Action Air Rifle, 177cal BB, PinkWood Stock with Fun Kit, 35.4 Inch, Pink/Black

I unfortunately do not use any written resource for my kid training. I grew up on a farm with a father, grandfather and uncles who were all hunters, police and former military. I started shooting when I was 5 and had lots of teachers to train me both the right and the wrong. They taught me the joy of target shooting, the strict adhearance to the rules (while still having fun) and to never point a gun at anything you don't want to destroy, kill or eat.

The biggest thing I can say is make sure you teach them the joy, that you make it fun. As it becomes work (and it will become more work as they try to improve) its easy to forget the simple joy of being outside, in the country, with friends and family, target shooting and trying to one up eachother. So try to make sure you add as much fun as you can. Play games (use playing cards to make poker hands), shoot steel or spinners, balloons, things that fall down, etc. Show them how to have fun and be safe. Becareful showing them up (learned this one the hard way). If you are shooting when they are and you can put 5 rounds in less than a quarter at 100 yards and they can only hit a pie plate at 20, they get discouraged. Do your best to encourage them. They might not start out strong (but don't be surprised if the little buggers can outshoot you, they have no bad habits yet) but as long as you celebrate the wins, downplay the misses and always make it a positive experience you will have a shooter for a lifetime.

As far as BB guns go, we have two now. One, my Gamo Little Cat I can use with both my 5 and 7 year old (due to a lighter trigger pull, its about 3.5#), my 7 year old is a laser with it, my 5 year old its still a bit too long but she likes to feel big like her sister so it works. Its a single cock (my 7 year old can BARELY do it herself, its like 15lb pull) spring powered pellet gun. Works great for teaching fundimentals. It has a weaver mount on it so I put a little cheap 3x reddot scope on it (because we tend to shoot in the evenings where the lit up reticle helps) and they love it. Last christmas, I bought her a Daisy Model 1998 in pink, and then we fixed it. Red is much more her color. Its crazy accurate, she is slowly learning on these sights (but is complete garbage when its low light) and loves to shoot it but doesn't enjoy it as much. Also, my 7 year old struggles with the trigger pull. I swear its an 8-10# trigger. My 5 year old can't even do it with both hands. This got put away until they get a little bigger.