When Should I start #2.
Building and flying are two seperate skills.
My advice is build what ever you want and as many as you want
But remember that just because you posess the Skill to BUILD it does not mean you posess the skill to FLY it!!!
Enjoy your flying your alpha. while your learning
BTW the way its not on common for people to have kits for years before assembling them ask me how I know.