As already said, there is so much here that is unknown ... and personal!
What is perfect and right for one person, is so wrong for the next.
If I were you, I would start out with my dream list of what I want.
As you do your current sewing, laundry, etc. think as though you are working in your new space.
What is needed? Do you have a place to put this? or that?
What is the ideal layout/flow for YOU? etc. etc.
How many others would be using this space eg. just you? children? husband? etc. all affects what would be perfect!
I did this in planning serious renos to my former home, in particular for the kitchen, eating area and laundry. Once done and I lived with it, I had absolutely NO regrets, even though the one kitchen cupboard guy told me I was all wrong. Guess what? he did not get the job!!! Instead someone who was willing to work with me, and help perfect it did. In the end, there was very little change from what I had planned out.
Yes, we all may not be helping you "cut to the chase" as you want.
However, if you really want to have the no regrets later ... you really need to take the time and figure it out yourself!