somewhile > at some time; at some former time
4 From heaven's bliss and everlasting rest; 5 Him needed not instruct which way were best
needed not > [it was not necessary to]
6 Himself to fashion likest Florimell,
likest > most like
7 Nor how to speak, nor how to use his gest,
gest > bearing, mien; gesture, hence: gestures, "body language"
8 For he in counterfeisance did excel,
counterfeisance > imposture
9 And all the wiles of women's wits knew passing well.