Advice for a beginner? & Potential bad habits?

I own(ed) a 22' challenger had an automatic for 3 years, someone hit me and It got totaled. Bought another 22' but this ones stick, I've always wanted to learn but as of 2 days ago I never touched one in my life. The cars currently about 400+ hp / torque. I feel ive picked it up pretty fast, while cruising im rev matching good so no herkey jerkey nonsense. But my two big concerns that im afraid might be bad habits are.

1. When I know im coming to a stop I'll say be going 40, I'll put it in neutral let off the clutch and coast to the sign, light, car whatever it may be using the break to stop. Once im stopped I'll stay neutral untill I need to clutch into first and take off again. Is that bad in anyway? I just dont see the point in shifting thru all the gears if I know im stopping. And if in the event I no longer need to stop, depending on my speed I'll shift into whatever gear, rev it appropriately and start going again and with a smooth shift I assume that's safe?

2. Going around gentle turns and such were i need to slow down a little but not alot I just press the break, no clutch no shifting just a little breaking to drop 3-8mph. That doesn't happen often though as just letting off the gas and letting the engine slow me down seems to be enough most the time.

3. This ones my biggest concern, when I go from a complete stop ive noticed a few scenarios.

First. Too much gas and too fast release on clutch makes me spin the tires, that tends too happen on hills as I'm trying harder not to stall or roll. Frankly I'll burn some rubber over hitting the guy 1" off my bumper behind me.

Second. Not enough gas and too slow clutch I stall.

Third. Moderate gas and clutch make it very jerky. Like it doesnt know if it wants to rip off or stall out.

Fourth. This is what I try for but I feel its 'riding the clutch'. As I start letting off the clutch I give it some gas, then as the clutch grabs i hold / very very slowly let off it while give gas an smoothly pull away, then giving more gas and releasing the last 1/4 of the clutch I drive off more quickly. It feels smooth and to me it's correct but I fear that couple seconds holding half clutch / really slowly letting up is bad but I can't figure out how else to get a smooth takeoff?

Little side note too, nobody showed me or knows how to drive stick in my life. So im learning from YouTube and figuring it out on my own.