Getting a recommendation from the management - What to tell them

Hey guys, Im applying for a programme of my University, and i do need recommendations for this.

Here is my situation:
-I am working since 6 months, and I want to start the programme paralelly to work
-i do perform good, my managers have a good impression on me, but im not a slimy guy and i hate to slime around
-i am working at a BIG4

I will get around 5 recommendations from professors
BUT
I do also need recommendations from my "working environment"
Question:
- who to ask for the recommendation?
--> the manager ( they are not at the very top, but higher as seniors and enough in contact with me to judge my work)
--> the partner (i doubt he even knows my name - but maybe he would talk to managers about me and the recommendation)
-how should i ask the person
--> how much text should i write
--> what kind of information should i give him/her
- university transcripts ?(i dont wanna bragg around, but i think they need to know a little bit more than just the fact that i can do gruntwork)
-how can i maximize the impression in the next couple of weeks, does someone know how to apply achoring techniques at work?

thanks for any useful tips and hints!

Florida