Just started runescape 3, need some advice

Just started Runescape 3 and need some advice on some beginner quests to do right now. I'm planning to do the basics such as waterfall, but what else could I do? Also what would be the easiest way to do fight arena, should I just mage throughout?

 

do waterfall, then get magic up a little and you should do fight arena with ease, aswell as tree gnome village/the grand tree also just require a little magic

 

thank you - I've been out of runescape since 2010, what's the fastest way to get 43 prayer? Think it'd make doing quests much easier. My friend has given me 30m to work with

 

Use frost/dragon bones on gilded alter, you will get 43 in no time.

 

Do some of the f2p quests as they give a decent amount of xp then do dragon slayer, waterfall and the work towards completing the p2p quests. To get 43 prayer I would use Dragons bones on a gilded altar but don't use frosts as they are more expensive.