Re: First cycle (Deca)
If you use Deca alone you won't need and AI as it doesn't aromatise or indeed one for PCT just a Serm.
HCG will need to be pinned and not drunk this will render it useless HCG will raise Oestrogen levels too.
26 weeks of Deca only will shut you down hard, possibly causing ED while on cycle, you'll need a strong, solid PCT to get things going again, not sure of your age but this could impact your fertility.
If you do decide to run this then a Test base 100mg ew would be the sensible way to go if only to maintain libido.
I'll let Dave explain the science behind it and he's a man that knows his shiz when it comes to PED's.