toys > games; amorous games
3 Now singing sweetly, to surprise her spirits,
surprise > capture; lead unawares (into doing something not intended)
4 Now making lays of love and lovers' pain,
lays > songs
5 Branles, ballads, virelays, and verses vain;
Branle > {A French dance, or the music for it} virelay > {A sort of song originating in France. See SC, gloss to "November"} vain > foolish; empty; weak
6 Oft purposes, oft riddles he devised,
purposes > riddles; games of questions-and-answers
7 And thousands like, which flowed in his brain, 8 With which he fed her fancy, and enticed