I put in 2 sandpoints in the last 5 years. I used a 1-1/4 sandpoint with 30 feet of 1-1/4pipe( they come in 5 foot sections) drive cap and couplings. My water table is about 20 feet down. Make sure you drive the well 10 feet below the water table. You can check with a piece of cloth string attached to a large nut or weight. Drop the string and weight in until it hits the bottom pull it up and then measure how far the water mark on your string is. I purchased everything from Fleet Farm in Hudson WI. I heard that you may need a permit to buy a sandpoint from Fleet Farm or any other store located in Minnesota.
It takes 2 guys to get the couplings tight. One on each pipe wrench. You dont want any leaks or you will loose your prime.
Also what really makes driving the point easier is soaking the ground with water for a couple days before you start driving. On my second well I first dug about 4 feet with a post hole digger and then ran a hose in it for a day. Much much easier. I did my first well with a 12# maul and a 6 foot ladder. My second well I used a heavy duty post pounder. Much easier! I have All sand with no clay. If you have all sand it shouldnt take more than a couple hours of pounding. Have fun!
I forgot to mention to turn the pipe a few times after each section is addede as you go down. It help to keep the sand point from being plugged. When you reached your desired depth flush out the well with water. You should not be able to keep the pipe filled with water. It should run back down out the end of the sand point. Then disenfect by pouring a 10-15% bleach water mixture into your well.