Depending on how much time you have you could do the whole thing manually. Having managed a 60 seat centre doing this it became second nature, you will benefit from this when you do wish to purchase a system. Have you seen the book “Call Centre Management on Fast Forward” it will give you a step by step guide, which if followed will give you a shcedule as accurate as any expensivr system as it takes you through the (almost) the same steps that something like TCS would do.