Hi and welcome to TE, great bunch of women here!

I myself can't help you specifically, but I'm sure others here will have some knowledgable suggestions for you....I just wanted to say hi and good for you wanting to start riding outside with your child in tow!

Also, this ais a favorite blog I like to read, written by a family that does a lot of kid-hauling on their bikes as part of their everyday lifestyle- you might find some useful info there or just enjoy reading their bike adventures:
http://carfreedays.com/

Bike on.