For spells that do require a save, then the save DC is 8 plus your spell casting ability modifier plus proficiency bonus (Basic Rules v0.2 page 81 under Saving Throws). The spell damage is listed in the spell description. Sometimes the description will include the spell casting...
AC = The Armor Class you're trying to beat M = Your total to-hit Modifier (including proficiency and ability bonuses) This equation first subtracts your to-hit modifier from your target's AC, which will get you the minimum number you need to roll in order to hit. Once we have th...