Tainted Oozes (market GREEN on the map) - Oozes infest Felwood in great numbers, and although they do not have too good Loot Table, they might be still worth Grinding. This spot is a long shot, so be warned. Felwood Oozes have a small chance to Drop Oozing Bag which in turn has a small chance to contain the Disgusting Oozeling Pet (this pet is used to throw off various Debuffs in Raids, so many Guilds will require you to have it), the Bag can also contain various Potions, Herbs, and Gems. Oozes themselves drop a lot of low-value Vendor Trash Items and some Pocket Money (they can also be Pickpocketed, so Rogues might be more interested in this spot). Recommended Level - 50+.
Escort quests can take awhile to do. I have thoroughly tested all the escort quests in the game for time/xp. Most are worth doing, but as long as you are able to actually do them without failing. Most require you to pay special attention to the escortee as most are fragile and will die easily, so do your best to keep mobs off of the escortee during escort quests. The longest one in the game is the Tanaris chicken escort. The chicken escorts are only worth doing if you were able to do all 3 of them, as if you do, you will be able to turn in an additional easy quick XP turn in quest at BB, which makes them worth it.
Swim Speed Potions (used especially at lvl 37 for Faldir's Cove in Arathi Highlands and lvl 57 in WPL). Try to get multiple stacks of these. I also recommend keeping a stack of these always in your bags. You will frequently pass rivers and lakes and can use these potions to pass them faster through out the guide. Please note that these potions do not stack with Druid's Aquatic Form and Glyph of Aquatic Form.
Cold Eye Basilisks (marked RED on the map) - Western shoreline of the middle Stranglethorn Vale is infested with deadly Basilisks. These monsters are a good source of Heavy Leather and Thick Leather (we recommend Skinning for this spot), they also drop a lot of Vendor Trash Items (Curved Basilisk Claw, Intact Basilisk Spine, Large Basilisk Tail, and Squishy Basilisk Eye), Large Fangs (used in Leatherworking, Blacksmithing, and Alchemy Recipes), Wicked Claws (used in Leatherworking and Blacksmithing Recipes), 12 Slot Bags, and most importantly, Cold Eye Basilisks have a small chance to drop the Cold Basilisk Eye (a level 35 BoE Trinket, that can be very valuable, because useful Trinkets are rare in Classic). Recommended Level - 38+.
Check Item's Vendor Price before posting it on the Auction House - Selling items on the Auction House below their Vendor value is a common mistake. Avoid it like fire, and always make sure that you are not losing Gold on your Auctions. If you plan to sell an item on the AH for a price just a tiny bit higher than its Vendor value, you might be better off just vendoring the said item (this will allow you to avoid the risk of losing an Auction fee if your Item doesn't sell).