What would be the best way to make money in runescape for me?

Either cut yew trees until you are level 80 then go to magics. Or you can train your fletching until it is high enough to make Maple Longbows (u) then sell those. Or you can also just do Clue Scrolls and hope you get lucky. That's what I did and in about 2 hours of doing clue scrolls I made around 500k.