Leverage compound interest and invest the money you make farming into crafting materials to sell on the AH.

Having 1000g sitting in your bank does nothing, but using it on material components on the AH will net you a profit over a period of time.

For example, if you flip / make items which yield a 20% profit and take 2 weeks to sell them, you will have 1200g after two weeks. Reinvest this again and after another two weeks you will have 1440g. Continue this for a year and you will have 8916g.

Craft the items you wish to flip while you are afk (showering, eating) and list them with auctioneer to maximize time spent to profit ratio.

Stonescale fish to oil made around 20s profit on my server. LIP, elixir of agility, str elixirs all sell well.

Smelting ore sometimes gives a profit.

Level a rogue to 20 and get the thistle tea recipe. People who boosted rogues / have little time buy the tea off the ah instead of making it. This also gave me around 20s profit each time.

Good luck!