Really, the BR is not the issue here, IMO. The issue here is OP is asking what BR he needs to play nl100, and offers no other info.
If anyone has developed their game to the point where they are ready to give nl100 a try, they will certainly know what they need in their BR, as they will by now have developed a BRM, otherwise they would not be ready to move up.
Unless they have lots of cash and just want to "play".
In case one, they will have an agro shot taking approach of maybe 20bb, a somewhat standard 40-50bb, or a more conservative 60+bb strategy. Either way, they know real basic stuff, like BRM. The wont need to ask a question like "how much do I need?", although they may ask advice on shot taking or differences in levels, but if the have a BRM question, it will have more involved in the question then just "how much".
In the later case BR is unimportant, as the player a: has cash and b: will probably lose it.