Ragefire Chasm- won't be able to enter it till level 15 I believe. If this is your first horde toon though I'd honestly recommend leveling with the quest and without heirlooms or a guide. For me personally I've never gotten attached to a character who I spammed dungeons with and normally I quit them around 60 because I can't be bothered with the toon anymore. Can only kill so many loot piñatas before I get sick of it.
What is this number? It's the user interface (UI) version for the AddOn. For instance, "80000" would correspond to WoW versions 8.0.x (where x is an arbitrary number). This number specifies which version of WoW your AddOn is compatible with; if it does not match the Blizzard UI number, your AddOn will be considered out of date, and will not be loaded unless the user checks the "Load out of date addons" checkbox before logging in.
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