Wcing yews, they are over 400 each atm. Mining is always good, but a bit tedious. Fishing lobs isn't as fast as wcing, but it's still not bad money for f2p.
Craft fires if you're f2p...much faster exp now, since the altar is really close to the duel arena bank. If you're a member, then try zmi altar? Not sure, didn't really rc much when I was a member a while back.
Pure ess would be great right now. Picking flax also works, to get some starting cash. Depending on your skills, you could try wcing yews or fishing sharks. If you have the stats for it, dking/barrows also makes nice cash. There are way too many ways to make money as a member.
Sell the axe, keep on dking unless you like wcing for money. Wcing isn't exactly the fastest way to make cash. Also, don't depend on getting a daxe as a drop, it's completely random when you're going to get one.
Get 55 slayer, and mage all the brothers except for ahrim in melee armor. Range ahrim with either rune cbow, or msb w/rune arrows. Look in the AoW section for some good guides on barrowing. :D
Cut yews at gnome stronghold...you won't get yews easily at all once you hit f2p. Instead of a massive amount of autoers, there are massive amounts of actual players trying to make cash. It's almost as bad as before :(