I see IRF530 shown as both N-channel and P-channelhttp://www.digikey.com/product-search/en?x=0&y=0&lang=en&site=us&KeyWords=irf530
Note: I added a 10k resistor to ground connected to the Gate, is it ok, or should I remove it?
How are resistors (R2 and R3 ) chosen for mosfets? How are they calculated?