How to scale pseudo random numbers to a specific range?

How would I scale random numbers to say 1-10 whithout loosing the randomness?

I know, just using % 10 is not a good idea.

And in addition, I need a seed value, so I can test on determinsitic numbers,

but I have not understood what value this seed should have and I how it influences the sequence.

Is there a difference if it is high or low ?

thanks in advance.