2001gmc serria1500, when I turn the key, I get nothing, help me please?

Check the battery may need to be replaced. Remove and clean terminals, may have bad contact. Could be the starter. If everything is o.k. with the battery, tap on the starter, do not hit it. while turning key to start, may be stuck or bad.

Bought a new module , I had ignition, then completely shut down, HELP!

Battery tested good, starter brand new.

Did you test the old module to know that it was bad? Did you program the new module? If the module was indeed bad, maybe the cause is still present, there are some reasons that can damage a module: PCMs typically fail for one of two reasons: voltage overloads (often due to a short in a solenoid or actuator circuit) or environmental factors (corrosion, thermal stress or vibration). If the shorted solenoid or actuator isn’t found and repaired, the voltage overload it creates may damage the replacement PCM, too.