50mg of winny eod ain't gonna do much.
50mg/day would be better, but it's not a 'mass builder'.
If you want the 20 pounds, you would have more luck stacking the test with deca. And then, if you want throw in the winny. But I would hold off on the winny if this is your first cycle.
Something like 300mg/deca/week along with your test.