I want to make a deck that I don't know how to make

So I have been trying to make a "strategic mill" deck for a long time. It has been my bane and I finally want to conquer it. So I have a few questions/tips needed.

To be clear I dont want a deck to be built for me, but if you guys can point me in the right direction, I would be very greatful

The goal of the deck

I want to stop combos or remove the big hitters of the deck before they have a chance to exist anywhere but the deck.

To start the cards I want to use

• Circu, Dimir Lobotomist
• Ashiok, Nightmare Weaver (maybe actually, I just like the exile)
• Jester's Cap
• Aven Mindcensor

Questions

1. Win condition

• The cards I stated I want to use, would take too long to mill an entire deck.
• Should I make it a control, mill, artifact
• what would work best for an esper colored deck?

2. instant/sorcery to creature ratio

• I know this is dependent on what kind of deck the end result should be but I have always struggle with this. I would either have all creatures and hardly any instants/sorceries or very little creatures.

3. Suggested cards

• I have already used This post as a base for the anti-combo thing.