Use the 5e PHB instructions to create your character. You can find the official character sheet here

Use the following base stats:
8 10 12 13 14 15

Use the average dice roll for leveling up.

You don’t need to use the personality traits, ideals, bonds, flaws, in the PHB if you have a good character backstory. Actually a backstory is just a lot better for roleplay!

Ask the DM if you want to use character options from other published books or if there is something you want to incorporate to your character and you don’t know how.

Please email a copy of your character sheet when done!

For leveling your character, just take the average of your hitdice.