Pick up Iron daggers at the respawn in wildy and then sell to general store! Very good money there. Haha just kidding, I'd say runecrafting too. Once getting some levels, air runes become very profitable. (f2p)
Go party? No seriously... what is your question really? What you should do is buy more arrows and shoot at monsters (hobgoblins) to gain xp. As simple as that...
Yes you need 25 agility to get up. Agility pots can be bought from other player for a few k's... Although I reccommend getting your agility up to 25 as it doesn't take long.
I quit playing RS for a while juat about when they made that cave in Barb Village, and I wonder if there is anything new since then? (for F2P) ~ImForReal