In this guide i will be trying to explane how to get lots of money fast!
Your best bet is to probably do GS Mini, GS's alch for 45-50m, good cash, keep returning you also get mage xp some keys get you to 49 mage, others get you to 99. buy alch runes (???nats, 5 fires)(dont use fires while alching) buy them and alch away!
Another way is the kill the Arena Mages, guthix Sara and Zammy. they drop various 3rd age items including melee range and mage. the also drop dark bows and god books. but your looking for the 3rd age. 3rd age pieces alch for different prices, the highest is the melee platebody which alchs for 35m and the lowest is skirt or range vambraces.
Barrows, if barrows is more your style, trying to sell them to players at edge who desperately need it, it offers quick cash, but you cant garentee that you will make the same profit each time.
If Combat cash ISN'T the way for you, then you call always turn to skilling...
There are 4 skills, skillable in 0swaldowns.no-ip.biz, they are Fishing, Fletching, Thieving and Woodcutting.
Fishing = Fishing mantarays at lvl 99, not very good since it takes a while and people use Easter eggs for pking.
Flecthing = when you reach 80 you can make cash quick. crafting and alching Mage longbows.
Theiving = i wouldn't recomend this, it takes about a week (no joke) to get it to 99. only make a small profit.
Woodcutting = moderately good cash when you hit 99! you make half a mil in about 10 secs, although compaired to fletching this is tottaly rubbish.
Pking, only good for cash when pking NO GBS i reapeat NO GBS! you may come across people who have rare items of armour such as saradomin or zammy, which you can't buy at shops. you can Vs them and if you win you could sell to a willing collector for a fair ammount. BUT, if you lose then thats more cash going down the drain, when pking non GBS, try pk people with bearhead, as they alch for 700m.
Hope i Helped.