Improving your attack level increases your chance to hit an opponent.
Basically yes. The "Strength" determines the maximum damage caused, while a higher "Attack" level improves the probability of causing damage to an opponent.
You can go to multi kill areas and ask other higher level people to attack a creature before you attack! although you won't get the items.
level 138. there is no higher level on runescape (for players)
By fighting.
You can do dragon slayer at any level, but I'd suggest getting higher strength and attack if you are going to fight it with melee and if you have not already, get your combat level to 40 or so.
Try getting your cooking level higher on lower fish, and raise it higher than 15 so you can cook trouts easier.
You can keep training on Goblins and level 2 spiders as a mean of getting higher, eventually when you reach level 10 you may want to move on to cows, collecting their hides and storing them in bank can be a great way of making money when it comes to selling them.
Yes and so does attack
Your able to get your attack up fast if you attack and kill animals or people above your level you gain more experience. When I played Runescape I used to do this alot. It's great fun isn't it!
level 99 woodcutting.
99
In my opinion it is a mithril scimitar.
Of course not.