Read this New Member Information and follow the instructions to promote yourself so that you can attach your project for comment.
You should also quote your KiCad version, from Help > About KiCad > Copy Version Info then paste into a Preformatted Text box, the </> icon above.
Solder paste and solder mask are different things. Normally you do not need to draw on the solder paste layer, it is derived from the pads of the footprints. And solder paste layers are only needed if you are ordering assembly or a stencil.
If the entire solder mask layer is missing, you probably didn’t send it to them. You probably need to read this How does solder mask layer work?
There are a couple of JLCPCB plugins that will generate the appropriate layers and send it to their order page to make your life easier.