Honestly, I have no clue if what I did is correct, can someone verify it? Second, How can I find the power of the current source?

 

One of the nice things about circuits is that you can (almost) always verify your answer. There are many ways to do this. Analyze the circuit by a different methos and see if you get the same result. See if the voltages across and the currents through the various components agree with the component values. Determine the power supplied or absorbed by each component and confirm that they add to zero.