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The Overwhelming Soul is an archetype of the Kineticist. Look to the base class, read it, and figure out what Overwhelming Soul trades out for its abilities.
You can use Gather Power to reduce the Burn cost of any Blast Wild Talent, using a Move action to Gather Power for 1 Burn reduced, a Full-Round action to reduce the Burn cost by 2 for your Blast in the next round, or combine a Full-round action in round 1 with a move action in round 2 to reduce the total Burn cost by 3 points. At 11th level you gain Supercharge, which increases these values to 3 points reduced for a Full-round action and 2 points for a move.
Infusion Specialization, Composite Specialization, and Metakinesis Mastery also reduce the total Burn cost of their components, depending on level.
You can combine Infusion Specialization, Composite Specialization, and Metakinesis Mastery with Gather Power to reduce Burn costs of any Blast Wild Talent.
The Overwhelming Soul also gains an ability to reduce the Burn cost of any Wild Talent once per day by 1 point, increasing to a number of times per day based on your level. This replaces Internal Buffer, which the base class gains.
Many Infusions become free eventually due to Infusion Specialization. The Overwhelming Soul can never use a Composite Blast without Gathering Power first unless they knock off a point or two of Burn using their 1/day 1 Burn reduced ability.
You must choose an element first, then select a Basic Blast from those available to that element. Magma Blast is a Composite Blast, not a Basic Blast, so you cannot choose it at first level.
I would choose Earth or Water Blast at first level so you aren't hosed against energy resistant/immune enemies until 7th level, then Expanded Element into an energy blast. Fire is the one with the biggest possible numbers, but also is the element resisted the most in the game.