agreed, Dave's does have a lot of useful resources. It's a pretty good place to go (and not the only) when you are stuck in your lesson planning and need a new idea, a new tool with which to teach a difficult grammar point or something. But designing a syllabus? That's something else.
First determine the course objectives; the college's and yours. What do you want the students to be able to do upon completion of the semester? To achieve a given benchmark on TOEFL/TOIC/IELTS/whatever? That's a measurable result. Your grading criteria for examinations and assignments should be straightforward to determine and easy to explain to students and college administration alike. Even when I have not been given clear course objectives by an employer, I use IELTs band descriptors as my grading rubric. Depending on my needs anaysis the first couple of classes, I try to achieve a specific band result with most of my students.
Or are they just expected fill time and say they've practiced English? That's a recipe called no doofus left behind, and its a recipe that's popular in most Chinese kitchens colleges and unis. In that case, you may as well forget about makng a professional job of it. No sense casting pearls before swine. Satisfy yourself with doing a more than competent job of managing classes while putting out random lessons on whatever interests you at the moment, and perhaps get a handful of students practicing a few vaguely language or work related skills. Make it up as you go along. Or, if you really want to give your syllabus some structure, get a set of books (I recommend Jack Richards' Interchange series, but there are others) and just copy that material. Shamelessly. And don't be afraid to let your grading criteria be based on such measurables as who you'd like to go out for a beer with, who pisses you off in class, who has a pretty smile and who honestly tries to learn something. That's what the other instructors are doing.