yea A+ would be a great start... i bet if you got the ComTIA A+ Cert you would be able to teach a computer class at your school maby?
Hopefully most school courses teach programming and not computer repair.
If you're a sharp person -- good logic and analytical reasoning skills -- I would suggest taking some courses intro computer science courses at a local university. Just a hunch, but I am guessing that you receive some kind of tuition reimbursement. If that works out, then you can probably teach a computer course at the school while finishing off the CS degree (hopefully you can get some of the work done in class... you'll have a bunch of little helpers, right?).
If you really want to be a sysadmin (and I really can't imagine why!!!), you're going to need quite a bit more than 'I've setup Ubuntu, Debian and Win2k Server on many systems'. You should have some kind of specialization... databases, networks, etc. If you have what it takes to install a database, create an ERD, do normalization, write queries / views and other db admin tasks, then you should make a very nice living.