I'll be homeschooling the same ages as you. . .a 2nd and a 1rst grader. . .with two littles along for the ride.
For your first year, and with such young kiddos, you can keep it simple. For example, do your 3r's with a "box curriculum" publisher like CLE, Abeka, BJU, or Rod and Staff, and then just keep the rest relaxed with library books or whatever interests ur kiddos.