RE: First plane
Ditto. Find someone experienced who can go over the plane and check it out for you to make sure everything is as it should be for the first flight..
If this person has a JR or Spektrum radio they can connect it to your DX5 and use the 'buddy-box" system. They can take the plane up. get it trimmed out and then "hand-off" control to your transmitter and let you fly it while giving you tips and commands and corrections. When (not if) you get in trouble they can take back control and recover the plane and then land it You can also do this the old-fashioned way where the instructor stands next to or behind you using one transmitter. When something happens they take control of the sticks and recover the plane.
If you can find a flight simulator that will help you also during your training.
Good luck !