would like to become a teaching assistant, best routes pleas

[corona3]

hi
i would very much like to become a teaching assistant,
what would you say the best route into further education?/secondary is,,as a teaching assistant
are there less TA's in secondary please?
which online courses have people had experience of please? i may not be able to schedule in college to do this route, although i would naturally possibly prefer this option
employability as a TA? longterm
many thanks
keep up the good work