Remember Precursor tablet exist and can be modified. You want breach ones.
Start with this atlas. By the time you get to 30/30 points you can drop #1, and respec top right
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Change when you no longer need map sustain
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MF on gear is mandatory but on your journey up to tier 15 focus on survivability > damage > mf
Start with just breach to get your points, then just delirium to get those points, by the time you get all of them you will be strong enough to do both (both is real rippy this game). I also recommend when you start doing both to unspec the Deli tree completely expecept keep "You just cant wake up from this one" till you get strong enough to really max the juice. Sustained Siege in the Breach tree may not be required for your Hexblast, its not for me but this is my second char and I was fortunate currency wise, so I have no frame of reference. If you do need it just drop Grasping Hands till you dont.
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Ritual tree (this will be useful cause its always around whereas Deli you have to force)
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Deli tree (I like this if you find it suicidal drop "Would you like to see my face and pick up "You just cant wake up from this one")
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Map Boss tree is you want it (aimed at max jice / difficulty)
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All of this combined is a long journey, but Hexblast is fun.