In order to get pure defence in Runescape, you kill monsters using defence stance accessed in the combat style thing. That is how you get pure defence in Runescape.
If you want to be a tank ranger than yes. If you are trying to make a pure and keep all stats down besides range than no.
When you attack, make sure your attack style is 'block'. This means when you attack something, you gain experience in defence only.
By fighting.
99 strength and 99 magic would make a good pure. I'm not gonna lie but that would be pretty awful, unless you had 99 range too, you'd be great. Ice barrage, K0 with dark bow. ^^
To make 100k in Runescape mine around 1000 Pure Essence ( Members ) or around 3000 Rune Essence ( Non Members )
Just create a new account and do quests that give you defence exp and train just defence skill, then train attack skill.
You use rune essence/pure essence on a altar. (runecrafting)
By fighting.
A Strength And Mage pure.
A str/Mage pure.
no
40 Defence