Homeschooling father of four. You will get some very detailed advice on this thread. However, keep it simple to start. The bottom line is that, if you make any effort at all, you will teach your children better than a public or private school. We start our children with a phonics reading program (Sing, Spell, Read and Write) which uses fun songs and other things. We think it's great. Then, some basic math (Saxon is used by many, including us, as it is very repetitious, though you might want to reduce the repetition as your kids catch on, or it can get boring). History at that age is Genesis forward. Do some spelling, basic writing, and that's all for that age (except for fun stuff you might want to add).
Bottom line, you have 12 years to teach them kids. Don't try to do it all in the first 2 years. And have fun with all the time you get to spend with them.
One more note. Several people have already said their particular curriculum is "the best". Don't believe them. Be patient and find the right one for your kids. They can be very different in how they learn, and you will start to discover the little things that can make a big difference in their learning, something public / private school teachers simply cannot do.