WHen I mention Brand Jungle, or lock it in in champ select, most of the time I get a "Why would you play brand jungle". In all honestly, you should not play this in ranked. The first clear, while possible, is extremely punishable by the enemy jungler if they know what they are doing. This is really a for fun build that should only be played in norms.

Though if you do want to play it in ranked, I hope I queue against you :)

This written section will explain how to do your 1st clear and gank, which are two things that normally are pretty straight forward. Since we are playing Brand however, the 1st clear is a lot more challenging to do, and ganks are a bit harder to pull off.

Brand's first clear is definetly the hardest part about his clear. You want to start on your Blue Buff Every Game (Can't do raptors until level 3). Your clear path is Blue -> Gromp -> Wolves -> Red -> Raptors -> Scuttle. Make sure you get a good leash from your laner. You will have to use both smite charges for your clear. Watch out for Invades, and give up camps if the enemy laner dcides to take them. After your first clear, farming will become signifigantly easier.
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The above video shows an example Brand Jungle clear from my most recent game as of writing this text. This clear is not perfect, however it should help give a general idea of how the clear should be preformed. Note that the clear does not finish before scuttle spawn (3:15).

Brand Gank's are suprisingly good. Ideally, assuming you took Dark Harvest, your laner can land some CC, which you can follow up with a E -> Q -> W combo. If your laner does not have hard CC, it is still possible to gank, but you have to land the stun. If you took predator and have flash, dont be afraid to pop them in order to land the stun. If you land it, Brand's damage should make it a free kill, or at least a flash burn.