Mold question

Hi,

I'm seeking out suggestions. Attached are some pictures of my first mold ( be gentle). What is being shown here is the A side of the mold and the 3D printed part I am using as the plug. Although this is for a product sample and not a prop I figured you guys could help. I hope to carry the knowledge over to prop building later.My question is in regard to the gate. I know I need to position it in a place where I can allow the air to escape. I was going to cut these in. I know it may require vents, but I am racking my brain on the best position. My initial thought is to place the gate in the split line and orientate the part vertically... Thoughts?

 

It is a little hard to make out what the end result is going to be. If we had an example or a little more description that may help.

As son as a plug is mentioned I think of this type of mold and it dose not require any venting. ------->

https://www.youtube.com/watch?v=dBEK_Jyfvek