Tests suits for PRNG

I am going to generate a Pseudo Random Number Generator for encryption perposes, each random number generates from previous one, but I have the following questions:
1-What the tests should I use to measure my PRNG quality (random)?
2-What's the tests measure the period of the generated PRNG?
I have the the three most popular NIST tests (frequency,block,runs), also I have (shannon entropy code) but I am not sure if they are suitable for PRNG?
Finally I am sorry if my questions are not in the proper place (stackoverflow)