You dont need a GPS, or lakemaster chip to find structure.. it sure can help. Studying map easily aquired from map books, or online on the DNR site http://www.dnr.state.mn.us you can use the lake finder to get current lake information and maps.
You have all you need with a flasher and an auger. Pour a little water on the ice and set your transducer on it and read right through.. or if its too cloudy(ice), drill a hole and check the depths.
I didnt use a flasher on the ice regularly until about 5 years ago.. and caught plenty of fish. All a flasher does is makes it quicker to positively locate fish, and fish harder for the fish you see below your hole. I used to simply drill a number of holes in an area and used a depth guage (heavy weight with clip) on a jigging rod to check the depths from hole to hole, and try to choose the most likely spot of the area.
People here have given you enough sound advice.. we cant go out and drill the holes for you… many of us who get away from the crowd dont enjoy others following in our footsteps uninvited.
Take into consideration where you are catching your *small walleyes* now.. depth, basic structure, etc. Find another spot on the lake, or another lake like it and you have a good place to start.
If you want someone to drill the holes, pay for a guide.