I'll be entering the community soon, as of now I'm still in training. The flight stick I bought when I originally perchased LOMAC is a Logitech Extreme 3D PRO. Is this a good stick to train and play with?

All you need for a joystick is
Throttle Wheel
4 or five buttons to click on
Twisty handle is very useful
And a Hat-switch on the top

Use what you have right now and see later, after you've gained experience, if that is sufficient.

I have used the MS Sidewinder for the lat 8 years that fulfills the basics. I've only recently picked up a Saitek Pro Throttle (for DCS:Black Shark)