so first and most obvious step the animation software.
if your a mobile user i recommend alight motion since animation of flipaclip takes a long process but if your a pc user you can use adobe animate if your poor but have a pc try using macromedia flash 8 its free if you get it on the archive
so heres a link to the software for pc users: Flash 8 download link
so here is a list of softwares i recommend for professionals who wanna take the LOOONG way[sorry if the site is now just a whole link this can be fixed once i learn more about html]