Look around for things to ship. You can find lots of items up towards the Goddess' spring and in the mountains... during the fall, there's a flower called the blue mist that sells for about 400G and herbs usually bring in a pretty penny.... during the spring, you can buy turnip seeds for 20G and they take about 2 days to grow... they have a decent profit as well.

well to make money, you have to buy 1 horse and make money to get it pregnant by shiping stuff, fishing, etc. then after you get the horse pregnant, youtrain it, by puting something heavy enough to make the controller make the horse run in one direction without you doing any thing . then before you go to the horse races you save the game so if you dont get first you just turn it off and try again. after you win first, remember the horse that came out of the pregnant one, sell it the next day(as long as its not a thursday)then repeat. simple i got to a lvl 5 house in 1 day with winning first place with 3 horses!

ride the horse all over the town everyday then as soon as you know it the horses points goes up and you will win a the contest

Bring your horse outside, duh, and ride it into a wall. Then get a rubber band and wrap it
around the analog stick and the rest of the controler. That way you don't have to do
anything but sit back and wait untill about 6 at night. At that time, you can put away
your horse, and also cheak your stats with your horse. It should be up one, if not, it
needs just a little more work, so do it agian tomarrow. With this method, I had full stars
in a month. Hope I helped!

Your horses points go up every 12 hours of riding. So, just do what the rest said. I just
kept running in to a wall day aftre day! :]