How to calculate initial velocity

I need to know how to calculate the initial velocity.
I have the velocity in the x direction and the y direction.

UR question sounds suspiciously like:
"how do I find the total velocity when I have its X & Y components?"

which is like asking how do I find the single vector size & direction
when I have its two components.

Answer: Since components must be at right angles to one another,
use the "hypotenuse rule" to find the size of the vector ie:
√[(X-component)² + (Y-component)²] = size of vector velocity

the direction angle Θ is given by:
arctan Θ = (Y-component size)/(X-component size)
{Comment: this angle Θ is best determined relative to the 4 quadrants by sketch/diagram}

velocity of what??
Not enough information.