I have a problem with the nitration products of 1-benzyl-4-bromobenzene and 1-nitro-4-phenylbenzene. Could somebody at any point clarify how for cut these mixtures and in which positions ortho, para or meta to put the amino group. Much obliged to you for any assistance.

It is not clear what you want to know. You do a nitration of this both mixtures? Why not separate first?  You asking for Aminogroup? The nitration guide first to Nitro products. Phenyl, Benzyl- and Bromine guide to 2,4,6 if available. Nitro to 3 and 5.

An Amino group hat to be obtained by reduction.