From a completely fresh beginning, you should craft "Summer Day Memory", "Passcode" and "Hot Item" and use Size 1 cards. you have access to plenty from the default beginner decks.
Fugitive Iri Flina
Cook Club Member x3
Gardening Maid x3
New Knight x3
Crescent Conumdrum x3
Student Council Roroa x3 (Best 1 point follower even after nerf)
Burning Guardian* x3 (or any cheap size 1 you like from the lab)
Summer Day Memory x3
Hot Item x3
Afterward, you can try make your deck better with "Warning", "Table Manner", "Sword Girl Sita" and "Battlefield Sita". After you farmed enough materials, you can now do your own thing. I recommend "Sita" deck because it is well balanced. It can PvP and deal with bosses where normal "Passcode" is at a disadvantage.