Normally, once the performance page has been satisfied the FMC calculates the v speeds for you.
And if not, a V speed chart which is temperature, pressure and weight sensitive with slope corrections.
A temp chart column reference allows you to select the column, and this can be further refined by selecting your wieght in Ib's.
And then another chart allows you to select the flap settings for the takeoff, a higher flap setting would require a lower speed.
As for your TO thrust, this is calculated when selecting your OAT with PMC's active, this too is temperature sensitive and when manipulated can produce a derated thrust.
Without your OAT or pressure altitude you cannot determine your V speeds correctly.
And please note, increasing your TO thrust won't alter your v-speeds but will alter your to ground run and climb rate should any obstacle clearances or minimum slope gradient be considered in the climb.