What I do is cut out to scale the outlines of all the things that must be accommodated. Then draw the outline of the room into large scale graph paper. I usually do 1/4 inch for every 6 inches. Draw all doors plus swing room, windows, outlets etc. Lighting too.
I put it on a cork board and move the pieces around until they make sense.
Remember the LA has both a foot print, plus the space you need around it to work. Will you be working from the back of the machine?
In kitchen design they talk about the work triangle. For me in a sewing space I have my piecing machine, plus server, the ironing board and cutting table.
For a LA, thread storage, rulers, batting, storage cart, are the main components of my triangle. Good lighting is imperative in both spaces.