I can tell you that whilst certificates are nice to have (and they can definitely help get a foot in the door later on in your career), they are nowhere near as valuable as a good attitude and willingness to learn (I can't stress those two key items enough) in an entry level position. Certificates or not, I'll still ask the same questions in an interview (no matter what type of job you're applying for).
There is no difference between consumer/commercial support, the users are just as helpless in the enterprise as they are in the house next door, and they can be just as patient/impatient. :)
If you have seen some entry level positions, you should absolutely apply for them. Like you say, it's a good way to get your foot in the door and we all had to start at somewhere, usually at the bottom of the IT food chain :)
Don't worry if you don't know what you're doing, which by the way I see as a lack of confidence rather than being clueless as a new tech, the whole reason you're there is to learn. Keep asking questions and find out how things work, and you won't go wrong.
If you're not successful when applying, keep your chin up! It happens to the best of us, and sometimes still does! My view is that a company that doesn't recognise a good attitude, and passion for your work isn't worth working for anyway. Good bosses recognise these attributes and a good boss translates as a good place to work.
I'm not sure where your interests in IT lie, but if you're into networking (and everybody should be, because network engineers are the rock stars of IT :) ), you won't ever go wrong if you start studying for the Cisco CCNA (or CCENT of you're super new to IT) certification:
If you have any more questions feel free to ask, and best of luck!