Hi M.,
You should look into Before Five in a Row:
http://www.fiveinarow.com/before/
Basically it talks about how to use classic children's literature and everyday life for learning. It's not a curriculum, but more like an idea book. It's great, and relatively inexpensive.
You might also look into Ambleside Online:
http://amblesideonline.org/
This is a free online curriculum based on Charlotte Mason's method, which is essentially learning through literature. In the early years it's mostly reading great books, going on nature walks, etc. You'd be looking at the year 0 recommendations.
I've got 3 boys ages 2, 4, and 6, as well as a new baby girl. People always ask how long we've been homeschooling, and I never know what to tell them. As far as I'm concerned, we've been homeschooling since birth. While we do have certain times of day set aside to work on specifics with the 6 year old, for the most part I want them to know that LIFE is about learning - not just "school" time. The advantages are too numerous to list - the best IMO is just getting to know my kids so much better. As for staying motivated - hook up with a homeschool group - there are many in the area - and spend time talking with the other moms. Attend conferences when possible, as the speakers are usually very good.
Good luck!