Unless you have one of the top 3 or 4 kickers just drop him if you don't have room. The 7-10 points you get from your kicker could be the difference. In the end it is to early to know who the truly elite kickers are any way.
Dude, get a kicker. You should never have any empty slots on your roster. Plus, a kicker can usually get you an average of about 10 points - that could be the difference between a W and a L. Just add your regular kicker back ASAP after your games are done.