Diet Question for Full Bulk Cycle

My cycle is fairly weak. I am a TrT patient. 125 test 50 tren per week.


Cycle

12-weeks
125mg Test/week
500mg Tren/week
12.5mg Aromasin EoD

4 days a week workout
7 days a week light cardio (walking trails and climbing stair up to peak and back here in Hong Kong)

I want a full Bulk cycle. I am ok with some fat gain at this point.

QUESTIONS:
How far over maintenance calories (LBM used for calculation) is recommended.
What metric should I use.
What should I do with diet leading up to the cycle? I have 3 months before cycle start. Should I go deep into keto diet before cycle start for a bulk?

Thanks in advance for the feedback

look up in the search function and check out Marcus's prime before the cycle