No, you can still join a league before Week 1 starts if you draft on Wednesday or Thursday afternoon. Most websites will still let you sign up after Week 1 begins, and it will just null that week.

If you don't have a league to play in, then check back on this section because I have seen people asking questions who are looking for people to join their league.

Nope, still got a week to join as many leagues as you want.

i did espn and yahoo leagues and i enjoy the espn one 10X better