Stained Bar Top

I am a complete novice when it comes to epoxy. I recently built a home bar.  The bar top is oil-stained and has a shallow 3/4" river which I planned to fill with small stones and then do thin pours to set the stones and fill the river with epoxy and then flood coat the entire top for a final finish. I've watched countless how-to videos and poured some samples with another brand epoxy that came out nice.  I went to my local Woodcraft store to purchase System-Three's Mirror Coat because I was told it can be poured on oil-stained wood. Woodcraft recommended Alumilite Clear Cast being it was less expensive. They said the oil-stained wood needed to be sealed with a water-based poly prior to pouring the Clear Cast.  So, here are my questions...
1. Can the Clear Cast be poured on stained wood without any type of poly?
2. For the front bar rail molding-Is it recommended to pour epoxy on that curved surface and clean the drips up or better to just poly that molding and then pour to it on the flat bar top?
Any other tips or suggestions would be greatly appreciated.  I really don't want to mess this up!