it' a bit hard to explain without know what u play, which limit, structure and last but not least without info on your multi-tabling.
Generically with a discreet tabling (6-10x) I assume something like 150x (BI) for Sng normal, 300x for Sng turbo, 200/300x (even more) for mtts.
The principle is: less tables u play less BR you need for, turbo structures (sngs either mtts) have more swings because of the higher variance (for the larger field) so they need more BR.
Increasing the limit, the BR should increase too-
Honestly I dunno too much for the HU play, sry (HU cash game HS is high variance, 100% ).
For the cash games I leave attached a table which might be useful to understand how to plan a correct BRM. However I think the below BRM table is pretty aggressive so, to a beginner i'd suggest a safer approach (i may add 20 stacks per level). And avoid cashout in the first 2 steps-
To have a cash reward is a good incentive but at that limit is too low and, taking out money means to wait longer to build a safe BR to the level up
Overall i feel to advice that you should play how do u feel safe. Players prefer a more solid approach others a BRM more aggressive to reach higher stakes early.
To dont go broke a solid management is better.
Good luck bro