Only if the Range level stays above your melee & magic kill levels.
by killing monsters
fist of guthix
no slayer doesnt because you can get xp for your cb lvl from att str def range mage prayer summoning and hp so your going to be using 1 of those methods for slayer so you dont really need it to get up cb lvls.
train everything up to lvl 100
you keep training your skill to get up to lvl 99
yes by getting up your strength def attack magic range and hitpoints .Also prayer, and summoning.
I am pretty sure its 4 but I i could be wrong
There is no command to level up on RuneScape. You have to train your stats through sheer hard work. There is no easy way around levelling up.
you get agility exp and when you lvl up, you can run longer
The exp they give you never changes the higher you level up, it will always remain the same.
know one will give u that height lvl account but i have a lvl 20 interesting add darfighter =) lol
Train on Fir Giants at Baxtorian Falls. Note: this is a popular training spot.