A basic first aid kit may contain:
We've always kept our first aid and medicines in our bedroom but, on reflection, what would happen if a visitor or house guest wanted access to first aid? So now I've put it in the enormous bathroom cabinet (which would otherwise be empty as all our stuff is in the en suite to our bedroom).
Having said that, many people say that more accidents happen in the kitchen than the bathroom, so that's the best place to keep the first aid kit ...
Here's another site (http://www.wikihow.com/Create-a-Home-First-Aid-Kit). It recommends having a container with two compartments: one for general first aid stuff and one for medicines for the family itself.
- cool pad (or could use a bag of frozen peas)
- burn cream (10 mins in cold water works wonders too)
For children see: http://kidshealth.org/parent/firstaid_safe/home/firstaid_kit.html
and for babies: http://www.babycentre.co.uk/a762/first-aid-kit-shopping-list
Finally, here's a useful video: https://www.youtube.com/watch?v=Mhab4Gp-hq4