Which part(s) of the game do you find difficult? A tutorial is due in the future, but right now we only have a write-up/tutorial for the crafting (it includes all of the recipes) which you can find here: https://funkyhippo.itch.io/epicshop/devlog/53823/craftable-items-and-their-recip...
A 1-player mode has been debated several times and it's unfortunately not going to be a reality in the foreseeable future - if ever. The reason being that the game is designed solely with 2 players in mind, and you lose a lot of the core experience we're going for if you play it alone - but who knows what the future brings!