You say take animo acids 30 mins before meals, so do i still take herbs 20 minutes before? i.e ten minutes after taking the animo acids.

Yes, the herbs are really not going to act like  a meal.  They will have some protein in the herbs, but you will not be taking enough to be an issue.

Just ordered some loose glycine powder, much cheaper than the capsules.

How much is safe to take at one go? Do you know what 500mg looks like on a teaspoon? i.e half a teaspoon?

Around a 1/4 teaspoon.  

I can't say i feel the Ashwagandha calming me. How strongly should i feel the calming affect of glycine, and is it good idea to take daily long term or as needed?

Everyone has different sensitivities to supplements.  So you will just have to try it and see how well it works for you. You can take it as needed, and it is safe long term.  Glycine will have other benefits as well such as tissue repair since it is a component of collagen and elastin.

I have stressful day coming up, and i also suffer from Social Anxiety.
So just making sure again this is okay.

Yes, nettle leaf is also really good for anxiety.

I will take 1/2 tsp Ashwagandha, (although i will normally be taking a mix of adaptogens,) 2 Seredyn,(high niacinaminde, l-theanine,passionflower,high mag taurinate,valarian combo) 500mg to 1G of glycine and tmg. I will take all this before breakfast and again before lunch plus my other herbs.

Remember that valerian has the opposite effect in some people.