@MikeSav The lessons learnt from your previous experience should certainly help you make better decisions now.
Its refreshing to see there are still people taking an interest in making the "craft" a means of living, and I do wish you success.
However, renting space/workshops is a big financial liability, as you will probably have to lock into a contract, so paying for it irrespective of income.
In the time you have, give due consideration to the range of products and therefore the market you are aiming for, then look around and about to see who else is offering the same, or similar, If they are a limited company check them out on the Companies House.GOV website, which will give you an insight into how they well they are doing.
Then ask the question do you need a "shop front" or can you hide away in the back woods, (which is where I am, no one really knows I'm there!) which consequently has a massive reflection in my cost of rent, when I had to move 7 years ago, some commercial places I looked at were up to £12K a year just for the rent, for 1500Sq ft, that takes a lot of earning, my rent now is a 5th of that.
My workshop space is about 900 sq ft, jammed with gear, I also have another area of the same size I use for storage and breaking down material, I also have the benefit of optional & substantial dry and secure storage space in the other barns that are adjacent to my workshop, absolutely essential for me when I start making larger projects (my work is mostly large joinery, doors, windows, stairs etc but does include kitchens and some furniture) that will be done over a long period.
One other point, I know of several "cabinet makers" who have shut up shop and gone back to more basic work such as site carpentry, joinery, fitting furniture and kitchens, which is tragic as they are very talented, and had been awarded guild marks for their work in the past.