RE: This will be my first EDF (F-20)
Islan,
I deal with foreigners all the time as they are are first level of server support; it can be difficult with a language barrier. I agree with stoneforcer on the setup though, you will need something to match the standard of a mega or HET-RC motor. Since you already have a 4S battery, you can simply purchase a second one to ge the power you need for a 4S setup; the single 4S 2500 is most likely borderline if it is 20C and will only offer a few minutes flight. A HET-RC 2W20 motor or Mega 16/20/2 as mentioned can be used with the 4S and as noted, this would require an ESC of at least 50amps or more at 4S power levels. Check out Markos at www-warbirds-rc.com for these items as he has them in stock and has great prices, as well as free shipping for everything. If you have any other questions, let us know. I have two of the HET-RC F-20's, which are most likely similar and I can assist through experience.
Best Regards,
Carl