How to create a black crested white silkie from scratch?

[Amer]

HI,
I was wonder if the lakenvelder coloring dominant or recessive?

Neither. It is caused by a variety of different genes, some dominant and some recessive.

would it be better to start with a lakenvelder rooster or hen

Rooster. Silver is sex linked.

could i breed with silver or buff later down the line to introduce new blood?

how can i limit inbreeding as I'm limited on space.

Don't do that.
You are already limiting inbreeding by crossing breeds.

Better than an outcross is selecting against undesirable traits.
Inbreeding doesn't cause health issues, it brings them to the surface if they are already in the genes.