There is no 'best' way. Examine the market and GE changes over the next week and see what fit yours gig best. Grinding chocolate dust might all of a sudden become extremely profitable due to drastic changes in the market. Learning how to properly merch flip is a very steady income at first, but eventually it turns into a booming increase once you get ahold of it and get more money to throw down as an investment.
It's not hard to look at your stats and go from there, starting from 0 gp is pretty rough. Sounds like your either going to have to resort to a resource skill such as Fishing monkfish, cutting yews, or even picking flax just to build a decent cash pile to begin other routes of money making.