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Fill in the sheet, then saving throws and conditions.
Start hereHow to Fill Out a D&D 5e Character SheetAlmost every box on a level 1 5e sheet comes from six ability scores and a +2 Proficiency Bonus. The SRD 5.2.1 formulas, with one Fighter worked through.
Core rulesHow Saving Throws Work in D&D 5eA saving throw is a d20 + ability modifier (+ Proficiency Bonus if proficient) against the effect's DC. Which saves each class gets, and Death Save odds.
Staying aliveD&D 5e Conditions ExplainedWhat a 5e condition is, the eight you see every session from Prone to Unconscious, how they nest, and what Restrained does to your odds. SRD 5.2.1.