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Before watching the gold guide video, create a bunch of buy orders with the following tips in mind:
1. Search for level 80 Rare Weapons.
2. Avoid "of Air" weapons.
3. Undercut by a copper.
4. Understand that the price of globs of ectoplasm help set a minimum price that weapons will sell for. Try to only stick to items going for double or more than the price of an ectoplasm. Otherwise you'll waste a lot of time checking prices for minimum profits.
When you have won a bunch of buy orders, watch this guide to sell them efficiently with the largest profit margin.