RE: Heli assembly
You will find all the info you need on these forums.
I use rcuniverse.com, helifreak.com, rcgroups.com, and wattflyer.com if you are not already aware of them check em all out. Someone has usually done the same thing or asked the same question.
Once you get specific questions you can get specific answers.
I didn't even notice your location, I must say your typed english is clearer and better written than half of the folks who attended school in this country. You should be proud to know english that well as a second language.
The flite power packs are good and you should like them. RX battery will allow you to set curves without having to worry about throttling up, later you can go back and program the esc.
See ya