I saw the most wonderful bumper sticker! "If you love Jesus, tithe - anyone can honk!" I just love that! Genuine faith is not just about doing the easy things, it's also about doing the hard things. In this economy, tithing may be a VERY hard thing. Anyone can honk, but giving money away when finances are insecure, that takes faith.
Homeschoolers focus on academics, and the Lord does want us to raise children in knowledge as well as wisdom. In the midst of it, remember to teach charitable giving.
2 Corinthians 8:7
But just as you excel in everything—in faith, in speech, in knowledge, in complete earnestness and in your love for us - see that you also excel in this grace of giving.
You can use a curriculum, but what really will help the skill "take" is if you can teach by example. Still, if you are looking for a curriculum, I love Larry Burkett's books, and they can at least get you started