Hi Pharma-sutra! Dosage wise concerning starting out with a Piracetam and Aniracetam combo stack I would suggest taking around 1,600-2,400mg of Piracetam daily (two capsules in the morning prior to breakfast, and another again before lunch) with the Aniracetam I would suggest about 1,500-2,250mg taking one capsule after breakfast and another after lunch.
I would honestly wait to include the Pramiracetam after you have given the Pira-Ani stack a few weeks worth of trying. Pramiracetam is definitely a great inclusion however you are going to want to give yourself some time before including it simply because too much at the beginning can either cause brain-fog or drowsiness.
In regards to which choline you should take I would personally recommend CDP Choline as a starter, simply because it shows mechanisms of actions in regards to stimulating the Dopamine receptors which might be able to help you with your social anxiety (I too suffer from social anxiety, so CDP is definitely a great choline source until you add Pramiracetam which when you do, I would recommend going to Alpha-GPC).
I initially had started with getting my L-Theanine from green tea, however lately I've been taking Neuro Breeze - L-Theanine and it has a much more pronounced effectiveness than just the tea alone. I'd recommend going straight for a L-Theanine capsule or source since you'll be getting more L-Theanine from that as opposed to getting it from green/black tea.
If you have any more questions go ahead and ask mate

hope this helps