For people who are not aware, you start at the beginning of the game, kill an enemy and then get a quarterstaff and
Quarterstaff Strike, this will be your first skill and it does a decent amount of damage and is great for when you are low on mana, so it is worth keeping, until we at least get
Ice Strike or
Tempest Flurry
As soon as you get your second skill gem, socket
Glacial Cascade, this has received a buff & a nerf in-terms of damage. It does less to normal enemies, but more damage to unique enemies. Martial Tempo & Glaciation are great support gems to socket.
For bossing, get
Tempest Bell as this will give large amounts of physical damage, stun and it will freeze the bosses using ailments, plus
Ice Nova will give a lot of freeze build up. You can also remove Glaciation from
Glacial Cascade and put it into
Ice Nova for even more boss damage.
One you reach level 14, take either
Ice Strike or
Tempest Flurry. Either of these two will carry you towards endgame.
Ice Strike support gem would be Martial Tempo, Concentrated Effect & Ambush work really well, you could possibly drop Cold Infusion from
Ice Nova and put it in
Ice Strike for even more dps.
Tempest Flurry support gems would be Lightning Infusion &Martial Tempo
If you are struggling with mana, socket Inspiration.
You could branch to Hollow Palm if necessary, but this will be a skill that scales better endgame ( see video: https://www.youtube.com/watch?v=7o7d72ptbx4 )