There a couple of methods:
1) set it and forget it
2) shake
Step 1. Get the beer cold. Step 2, put the gas on. For method 1, you want to just hook it up to about 10-12 psi and let it sit for 7-10 days. For method 2, you would want to crank it up to about 30 psi and shake the entire keg every hour or so for about 24 hours. Then, reduce the pressure to serving temp and serve.
I am a "set it and forget it" guy, so if you are interested in the second method, you may want to get better, more descriptive advice from someone who uses that method.
Regardless, your beer tastes funny because it is not yet carbonated.