We'll you can put off Russian reading for right now if you want, but still focus heavily and learning vocabulary and building CONVERSATIONAL Russian skills by having conversations.
The best way to teach grammar is to model it in simple sentences that grow increasingly complex, and use your words everyday!!!
AS time passes have an Russian Room, where Russian is spoken, and have a Russian meal, a time where the whole family speaks in Russian and listens in Russian and has conversations in Russian.
Find Russian Cartoons online, order Russian childrens DVD's and learn about Russia and study Russia. Don't learn numbers, letters, counting and generic greetings first. Learn them 51st. Unless you routinely tell your kids good morning, how are you. Don't teach them that in Russian first.
Teach them to say things that "this one" and "please" in Russian, because those are 2 words that kids use ALL the time.
(ie I want --THIS ONE, PLEASE.)