I am currently on a 12 week program to work on my SBD lifts. 1-4 weeks is a volume block. 5-8 weeks is a strength block. and 9-12 weeks is the peaking block.

All i know is that I should target my weak points.

So my questions are:
How should i be going about adding accesory lifts to my training?
What is the limit of accesory lifts I should be doing per session?