First Cycle

Hey Guys,
I am 27 years old and have been training for 11 years now. Have been all natural so far. I am considering doing my first cycle and have decided to go with a test only option. I plan to do 250mg twice a week for 8 weeks. I need help here, need to know how much HCG I should be taking on cycle to ensure minimal testicle shrinkage.

Also need advice on post cycle therapy, how much of what needs to be taken. Thanks in advance.

Need height and weight and goals in order to get meaningful advice.