I can't see you link at work, so would you mind telling me your class please? A lot of use can help a great deal on what you should build for. That $3 you spent on gold will be a huge start. There are builds that used to be called Big Mac builds, because they cost around the price of a Big Mac (if you converted gold into money @ $0.25 per million). Now, however, that costs you around a quarter. All classes will want Movement speed and the cheapest place to get it is on your boots. The cap is 24% (item cap), so you have to find the other 12% on other items, and depending on class and budget, this gets either harder or easier.
As far as farming, if you haven't already, I'd suggest doing a run through completely just to unlock all the way points (and get the achievements if that is something you're after). There are farm routes (and leveling routes for paragon, which is what I suggest). The thing about D3, and a lot ARPGS in general, is that loot isn't monster specific. Eventually, some of the items will have a greater chance of dropping on certain mobs (The Butcher will have a greater chance to drop The Butcher's Sickle for example), but currently, any mob can drop any level appropriate item. So, if you do a farming route (which are all based on highest monster density) you will be killing a lot of mobs, and getting a lot of loot. The key to farming is mobs per hour. The higher that number, the more items you will see drop. As far as quality, it is still all RNG, but having more lotto tickets, gives you a better chance of winning the jackpot right?