FAQ
It's up to the instructor whether to drop you from the class if you are a "no show" at the first meeting. Don't assume that you will be dropped - if you aren't planning on taking the class, drop the class yourself as soon as possible. On the other hand, don't assume that you won't be dropped - if you are planning on taking the class, contact the instructor to explain why you will miss the first meeting, and ask the instructor not to drop you.
Generally speaking, yes. A grade of "C" or better is considered a passing grade. However, to graduate, you need to have a 3.0 GPA or better in all course work.
A hold is on your record for two reasons: your overall GPA is less than 3.0 and you must come for advising or you have not submitted you Program of Study and cannot register until it has been submitted and approved.
A good "rule of thumb" might be to multiply the number of units by three and add the number of hours you work each week. If the total exceeds about 68, you're probably heading for trouble. (This assumes that the rest of your life is going fairly smoothly and not imposing unusual demands on your time, energy, and other resources.)