i am minor and got a DWI. so, i may lose my license until 18, or possibly 21. am i going to be able to get a restricted license for school and work, and for how long will this stay on my record?

you can request a restricted license; or there may be a period of ineligibility for a restricted license as well. If license is revoked, you would not be eligible for a restricted license.
A drunk driving offense is a criminal offense, and a criminal record doesn't disappear with time.