Rusty
If you really mean how to measure lift, try a pair of scales or a spring balance! Lift is a force.
If you mean how to predict roughly how much lift you can expect to get...
You need to know what limits you can adjust the lift coefficient between. Then multiply by the wing area and dynamic pressure. The maximum coefficient of lift will depend on the scale of your model (Reynolds number) but somewhere between 1 and 3 would be a good starting point.
So say you've got a 1 square metre wing and a 3 m/s wind tunnel. The dynamic pressure is about 5 Pa, and so with a lift coefficient of 1 you'll expect a lift of 5 N (or about 500 g on the scales).
Try plotting that lift against AOA. Don't forget to post your results here...