This is simply some animated mask strokes with additional noise, presumably easily done using Video CoPilot's free Sabre plug-in.
this can be VERY EASY if you have the vector files which I believe this is the case. you bring your Ai file to After effects - take for examples this vector file of Bicycles:
you right click on the Ai Layer and choose "Create Shapes from Vector Layer" now you got a Native Vector copy of the Ai layers, with all the Ai vector objects as Shape groups:
now you Add Trim Path Shape Animator and just play with the end key-frame to your liking
and for the end effects - Glow and such - there are many ways to do that and I believe M knows what he's talking about so take his advice.
Thank you very much for your help!
I'll look, thanks for the tip!