operating systems and networking help please? any1?

this is part of my assignment, i dont really mind if i dont get the answer, but i just want to know how to even work it out/do the calculations :/

can any1 just show the calculations with examples please?

any help please?

A processor has 24 registers, uses 8-bit immediates, and has 36 different instructions
(corresponding to 36 operation codes) in its instruction set. These 36
instructions are classified into 4 types as listed below:

Type-A: takes 2 source registers, uses 1
destination register;

Type-B: takes 1 source register, uses 1
destination register;

Type-C: takes 1 source register, 1 immediate,
uses 1 destination register;

Type-D: takes 1 immediate, uses 1 destination
register.

Assume that the Instruction Set Architecture requires that all instructions be a multiple of 8 bits (1 byte) in
length, and the operation codes (opcodes) are of fixed length.

a)
How many bytes do we need to use to
encode the Type-A instruction?

b)
How many bytes do we need to use to
encode the Type-C instruction?

thanks