I agree with Crackerjack (Crakerjack!)problems like this shouldn't be solved on the internet; your instructor, if he or she is worth their salt, should sort it for you.
There are dozens of rules of thumb for landing techniques, but they all differ slightly from aircraft to aircraf. Remember, you are trying to convert an aircraft in a nose down attitude at 70Kts to an aircraft in a nose up attitude at 50Kts. How you achieve this is determined by the conditions in which you find yourself each time you make an approach. If you raise the nose too early you will have excessive energy(speed)and probably fly away from the ground (balloon). Similarly if you are to vigorous with the control column you will achieve the same result. The idea is to always make sure you have sufficient elevator authority remaining to cushion that final sink to the ground. It is difficult to explain here, however try to understand what is happening to the aircraft during the approach, flare and touchdown phase and you will be able to cope with any aircraft and situation in which you find yourself. This is very much a task for your instructor.
Good Luck
Ivan