That's ok Ned, hopefully I can help a bit.
Humbrol clear coats are available as either enamel or acrylic so you can choose what works for you
Personally I use enamels as that's what I'm used to (although I'd like to migrate to acrylics one day, depending on what Sovereign hobbies does with Colourcoats range).
Anyway I start with the gloss coat
to prepare the surface, add decals if required and then finish with the mat coat
Keep in mind these are enamel though.
For aircraft I'll usually finish with satin coat as I find it too dull using the mat coat.
There's some great videos on those pages too.
However, you use acrylics, and acrylic gloss
may suit you better.
You can then finish with the mat coat
Again there's some helpful videos.
Of course it all comes down to personal tastes and what's available locally. I prefer Humbrol as I grew up with them, and I'm comfortable with using enamels and find that they work well with the Colourcoats range too.
Not to mention that generally, Humbrol are easy to get.
Metro hobbies in Melbourne can be of good assistance.
And I'm sure the aircraft and automotive guys have their own preferred brands for clear coats as well.
Looking forward to see how you go.