First I must say I'm quite impressed by the fact that you kept pumping SCVs. Usually people with not so much experience tends to stop at like 12 SCVs. Good stuff.
I'm also pleased to see that you binded your army. That'll get you one step closer to binding pretty much everything else in the future when you get better.
Building a supply depot (at 10) is probably the first thing you should go for (that early refinery is probably a bit of an overkill, especially considering that you'll get supply blocked for quite some time).
Remember that the max amount of harvesters on gas (your refinery) is max three.
As you got that engineering bay, you might as well had gotten that +1 weapon since you had the resources for it.
Definitely make sure to upgrade your command center to an orbital command quite early in the game so that you can start using mules (exta mineralers) or sweeps (free scan wherever you please).
When you build a structure, you can shift + right click his destination after he's built it. This might be a bit hard to remember at start but try to use it as much as possible, it's essential when you get better!
The techlab is a great add-on for upgrading your bio units (you got it early), so I'd recommend getting something like Combat Shield or Stimpack when you build the tech lab
.
Queuing up low costly units like marines/SCVs are fine but doing the same thing for super expensive units like the banshees isn't recommended.Remember that queuing them up won't allow you to build them faster
. You can use those resources to build another starport which allows you to build banshees simultaneously!
edit: And grab siege tech for your siege tanks! You'll be surprised how much ass you can kick with it :lol