I graduated my daughter last spring after homeschooling her all the way through. I know lots of people love Abeka, but it just wasn't for us. We were much more "free form", and I never used any one curriculum exclusively - just picked and chose what seemed best from year to year. I am a big fan of Saxon Math and Apologia Science, but those are for older children, so it will be a while before you'll be interested in those.
In the early years, the best thing you can do for you child is to read, read, read to them, and then read to them some more. While you're reading, look for opportunities to sound out words that get repeated frequently in the books you're reading, pointing to that word as you do. Gradually your child will begin to recognize letters, letter groups and words in an easy, natural way. Also, don't worry if your child takes longer than you expect to learn to read. The beauty of homeschooling is that your child can learn at his own pace.
You'll find lots of homegrown opportunites for little kid math, too - counting how many forks go on the table when you set it for dinner, things like that.
I love the Ruth Beechick books for homeschooling little kids - they're a set of 3 very thin books (written to the parents), and the set is usually referred to as "The 3 R's".
Ruth Beechick's 3 R's
Have fun homeschooling, and if you find yourself getting burned out, take a break from it and look for a different way to go about whatever you're trying to accomplish at the moment. Learning is so natural to little kids, it's really hard to go wrong in those early years, unless it's by pushing too hard. Just relax, enjoy your son, and let the learning happen. You'll love it.