Please explain step-by-step how to solve these kinds of questions

Suppose we have an N-way set associative cache with the capacity 4096 bytes. The set field size of the address is 7 bits and the tag field 21 bits. If we assume that the cache is used together with a 32-bit processor, what is then the block size (in bytes), how many valid bits does the cache contain, and what is the associativity of the cache