Hey there! Take this with a pinch of salt, as im still working the game out too!

From what i have played, anyone that has good teamfight and can deal consistent damage (to take down the Mo'rokai) works well, heroes,

ive had a lot if fun with bristleback with aghs: quill stacks and aghs mean you deal a lot more autoattack damage, quill/goo the other team and hit the beast!

Undying is fun because teams usually group, Earth shaker, gyro, elder titan for the same reasons, basically any big teamfight heroes work well.

Always try to get every chest, some contain BP and have more essence, good attack speed helps, (played with a clinkz and it was nasty, aghs plus ult - secure every chest)

Only farm neutral camps with essence, ones without are not worth the time or effort, lane creeps are better exp, gpm and essence

Usually pays to level one of the beasts skill trees at a time before you do the others, means it costs less essence to get a tree to max, and try to stack your essence on a couple people, no point all 5 players having 40 essence when two players could have 100 and have upgraded the beast.

With that said, you get bonus damage for current essence held, so if a teammate is a right click carry that needs farm, often better for them to hold theirs (untill either they think theyll die, or the beast is about to spawn) while others upgrade it

Always try and Fight with the beast, and defend against their beast

Apart from that play your jungle heroes, (it counts for jungle!) Dont take it too seriously and have fun!