Definitely go read Radd's School of Rotary Flight. I recommend you follow it. Pick up a sim, even FMS so you learn which way to push the sticks in an environment where a crash won't send you to the hobby shop for parts.
Below is specific to the Blade CP. The CP Pro can follow the same idea but already has LiPo and the Bell mixer.
Keep it stock except the batteries. I bought a bunch of NiMH packs and I sort of regret it. There are pairs of Li-Po packs available on line for a little more than a single NiMH pack at my LHS. You will need more batteries and a better charger. Don't upgrade anything else till you have a good power system. The stock charger gets you 5 minutes of flight for 2.5 hours of charging. With 4 packs and a good charger, I get about 33 mins of flight per hour and will increase that to 43 mins when I get 2 more packs.
The bell mixer upgrade is a good investment if your flying field has more wind than your stock CP can handle. Everything reacts quicker so you can recover when a gust blows you back and down. Move into idle-up as soon as your comfortable bringing the helicopter down under control even in a panic. Higher headspeed=quicker response to input.
Put a small small piece of tubing between the tail rotor gear and the bearing. These things pop out in a crash and are hard to find.
Balance and track the main blades, and balance the tail rotor!