Help, how do I BRD?

[Rongway]

Straight Shot. Once you've got that buff up, you should proceed to throw Venomous Bite and Windbite on your current target.

If there are multiple targets, these should absolutely be used on anything but your current target. If you're in a situation where where it's more appropriate to DoT than to spam AoEs, your first target will die long before your DoTs tick or proc enough to be worth it. Throw them at anything else to get more ticks out of them.

Don't forget about Battle Voice, it doubles the potency of your songs.

Turn on Battle Voice after your song is active. If you Battle Voice first, and then sing, it'll take a few seconds to sing and then another few seconds for the effect to apply (because of how aura buffs apply on the server tick), so you can lose up to two ticks of the boosted effect.