For example, if you are interested in an athletics administration assistantship, you could check out the NACDA website, and discover the listings they have for Graduate Assistantships related to collegiate athletic administration. Each industry and interest area will have different websites of value to your search.
Just like the individual programs, you need to start keeping track of application deadlines and materials needed for the assistantships.
A university’s own job search engine through the Human Resources website could provide available assistantship opportunities as well.
General search engines might list some opportunities, but you will have more luck with specific search sites.
TAs will assist full professors with teaching undergraduate and sometimes graduate level courses.
RAs will supplement research efforts taking place by the faculty in various academic departments.
If so, securing a Graduate Assistantship would basically mean going to school for “free" (that is, if you are all right with working around 20 hours a week to make that happen).
Most assistantships result in your tuition being waived.
Do not expect the deadlines to all be the same (something you will no doubt encounter for the applications to graduate school, if you have not already experienced that).
The requested materials will not necessarily be the same, either.