"Tromp as writ" means to “treadle as written,” and the assumption is that the “written” part is the threading draft. Here's more explanation of the term and technique.
Can you weave 4 layers of cloth at once on an 8-shaft loom? How do you get started?
Read a weaving book or a good article, visit a weaving exhibit at a museum or gallery, hang out with your guild or study group, in person or online. Wind a warp and pick up a shuttle when you can.
How do you determine sett for waffle weave? Madelyn can help you figure it out.
Which is the best way to attach to the apron rod? Lashing on or knotting?
I am not quite sure why the right selvedge is somewhat messy while the other selvedge is very neat. I am pretty sure it has to do with carrying the yarn.
How important is centering the warp? It is OK to split patterns in the middle?