Lets talk tile floor prep

I am going to be tiling a room in a basement, the floor has been previously painted.

I Intend to grind the paint off the floor via wire wheel and sanding pads to get down to the concrete then clean with a damp sponge 3-4 times to get all dust off the surface.

The floor is uneven in several spots, so I plan to level them out prior to tile, should I use a self leveling mix or a patch? I am going to be using Mapei products for the job. What product is best recommended?

I plan to put down Mapelastic CI after grinding to prevent cracks and get a better surface to tile on.

I am somewhat unsure of what comes next, do I need to apply a primer over the patch prior to putting down the thinset and setting tiles or not?

My tiling experience has only been in rooms with a wood underlayment where we would put down cement board and thinset over that. any insight would be helpful.

Thanks!