For more information see Core Rules: Character Creation
E.g. a level 1 fighter has a Death Ray saving throw of 13. If the character is a dwarf (dwarfs have a +4 to Death Ray saves) then the Death Ray saving throw will be 9.
Write your equipment down in the character sheet's equipment slots. Decent-sized items like weapons and armor take up a slot. Smaller items like torches can fit a stack per slot. If you have any questions, ask the GM. See image for example:
Your character can carry 10 slots without any penalties and may carry up to a maximum of 12 slots. Carrying more than 10 slots reduces your character's movement speed by 10ft.