2:30a I will show wonders in the heavens and on the earth,

I will put/place signs in the skies and on the earth,
-or-
I will amaze ⌊people⌋ by what I cause to appear/happen in the sky/heaven and on the earth,
-or-
I will show/display miraculous signs/warnings in the sky/heaven and on the earth.

2:30b blood and fire and columns of smoke.

blood, fire, and thick columns of smoke.
-or-
There will be blood and also fire with/and very thick smoke.

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