Puppy training that EILI5

We got our 14 week old puppy this past weekend. We're in love. She is house-trained (I hate the term potty-trained for a dog) with accidents happening because we didn't notice her signal.

She has 'sit' down cold, and now sits 'at me', unasked for, but staring at me like 'where's my treat?'

I'm working on 'stay' and 'come'. We haven't figured out 'down' at all.

But we have probably missed some steps. She doesn't always lift her head when we call her, for instance.

I started watching kikopup's videos and incorporated luring her away from my body with the treat, and giving her treats when she is just sitting calmly. But even attempting to watch her videos for beginners, I feel like she assumes prior knowledge or she references skills taught in other videos.

I read through all the wiki training links on this forum. But I didn't understand what a 'mark word' was or a clicker. (I know have a better understanding of that). A treat back and two clickers are being delivered Saturday (cyber Monday purchase meant very delayed shipping)

What I am asking for is a start-to-finish training program I can follow, with games that I can teach my 9 year old to play. (She's felt a little left out of this process) This program should assume no prior dog experience. (I had a dog someone had abandoned at 6wks when I was 17. But I didn't know what I didn't know, the result was a very sweet, but ill-trained dog. ) and I took her to puppy classes.

I homeschool throughout the day, so we can have 'family training breaks' throughout the day, we just need to know what to do, with a 'skill map'.