Gizmos

Whenever you take a faceup Gizmo from the Display (by File or by Build from the Display), immediately draw a new card from that same level deck and place it into the empty slot — after drawing the new Gizmo, your File/Build action is over (page 3).

Yes — you may use a Gizmo’s effect on the same turn it is built, but it cannot be triggered by the same action that built it, and each Gizmo may only be used once per turn (page 4).

No — choose a single facedown Level deck and draw a number of cards equal to your Research amount (you may not draw from more than one deck at a time); if fewer cards remain draw only what’s available (page 4).

Yes — actions granted by Gizmo effects are actions and can trigger other Gizmos; whenever you perform any action (including ones triggered by Gizmos) check and activate triggered Gizmos in any order, with no limit to the length of a chain, though each Gizmo can be used only once per turn (page 4).

No — a random Energy draw is not a Pick action: you draw blindly from the top of the Dispenser, whereas a Pick action specifically chooses one of the six energies in the Energy Row (page 3).

To build you spend Energy from your Energy Storage Ring matching the Gizmo’s type and cost by placing those spheres back into the Dispenser; active Converter Gizmos may allow you to convert energy during a Build action (see Converters in the List of Effects) (page 3; converters mentioned page 4).