Help with landing

Hi there,
1. can anyone tell me the right approach speed for a Boeing 737-800.
2. Why is it that everytime I am about to touchdown on the runway and start my flare, the aircraft starts climbing. Is it because of my speed or could it be something else.
3. Everytime I come up on final I try to hold about 150 knots but the plane never makes it to the runway, it stalls.
Please help.
Thank you
1. can anyone tell me the right approach speed for a Boeing 737-800.
2. Why is it that everytime I am about to touchdown on the runway and start my flare, the aircraft starts climbing. Is it because of my speed or could it be something else.
3. Everytime I come up on final I try to hold about 150 knots but the plane never makes it to the runway, it stalls.
Please help.
Thank you