cmacnulty

I just starting riding and learning as I go. Currently I am riding 3 times a week and up to about 125 miles a week. I am preparing to do my first centennial in September. I live in an area with a fair number of hills and my rides varying from 1500 to 3000 ft. I ride by myself a lot but have joined a club recently. Some where along the line I was reading about how to place my weight while riding. I pretty sure I am not doing it right since my hands get tired by the end of the ride.
Can anyone point me to some place I can learn about correct body/hand position in flat, on hills( both up and down) and what factors check while I am riding to get maximum effort and efficiency?

Thanks