If I'm being sued in Civil Court do I need a lawyer to fill out the Civil Case Information Statement (CIS) if I dispute the claim against me

Mr. Robins rightly answered that you hvae the right to represent yourself as long as you are not being sued as a corporation or an LLC. Whether you should do it on your own depends upon your legal expertise if you have to go to court and dispute the debt. It also depends upon the amount. If you are being sued in small claims for under $3,000.00 it may not be financially expedient to hire an attorney, but anything larger and you shoujld at least consult with an attorney. Additionally, in some types of cases, there may be entitlement for attorney fees, either by the plaintiff or by the defendant if your defense asserts certain defenses that are protected (i.e. consumer fraud or illegal withholding of a security deposit in a landlord tenant case). So you should at least try and see an attorney for an assessment of the claim.