Ok, if I understand you correctly…
I would:
1. Import the psd file into AE (you might want to get rid of the background color)
2. Create an comp sized adjustment layer
3. Be sure you have selected the adjustment layer, then Auto trace. This will give kind of a rough mask, so you might want to adjust it so it aligns with the edge of your logo using pen tools etc.
4. Apply stroke effect to adjustment layer, and animate this the way you want it.
Also you can play around with opacity of the PSD layer, animate this to fade in, or use write on effect to reveal it, see new excellent tutorial on this.
Hope it helps you!
Henrik