Hi,
Charger : This one is pretty much standard, low cost (I use it since 2 years with no problem) : https://www.asiatees.com/display?Miscellaneous-All-Parts-Hop-Ups-Upgrades&brand=Miscellaneous&model=All&id=97895&pid=1
Hi,
You should probably have a look at this calculator : http://www.ecalc.ch/xcoptercalc.php
I'm also starting a blog on quadcopters and will soon put some indications on how you can size it (http://byoq.over-blog.com/)