If your hero is not involved in battle with another player, they should continually be creeping. Keep in mind, though, that wow classic gold once a hero reaches level , they'll no longer get experience from battling creeps.
You will also find impartial buildings dotted around maps. The Goblin Laboratory, by way of instance, can market a Goblin Shredder, which is very good for collecting substantial amounts of lumber in a short moment. In addition they sell Goblin Zeppelins, which make fantastic scouts for recon. These neutral buildings are often guarded by creeps. If you just happen to need something out of a neutral construction, however the levels of the creeps surrounding you're too high, try awaiting nightfall. Creeps sleep at nighttime, which means that you may rush in and rush outside with no danger!
The early game in any match is all about efficiency and speed, as well as fielding the best units possible, as soon as possible. With various buildings dedicated to resources, tech trees, units, and defence, it's worth having a construct order in your mind so you don't get overwhelmed.
As with heroes, it is hard to give a definitive answer to what you should prioritise in your build order, since there's so many factors that could play to your overall strategy. That said, once you're first starting out, there are some generally agreed upon strings that are worth studying, if just to cheap classic gold wow use them as a template for your own. Nailing the principles of aggressive Warcraft 3 has been a years long iterative process. You will probably learn something new every time you play, see, or read about a game. That said, these eleven year old forum posts for Humans, Orcs, Night Elf, and Undead are a wonderful place to start.