You mentioned poor eyesight.  As long as one can actually see so as not to bump into things I’m not sure how that prevents one from cooking and doing laundry, people who are totally blind learn how to do these things for themselves.  But the ability to see to read would also be absolutely critical to the life of a scholar.  An early piece of advice, if this hasn’t been completely worked out, is to see a MD or DO who is board certified in ophthalmology, rather than an optometrist, get things checked, and sort out what might be done.  My father left a successful career as a certified public accountant to become a farmer in the 1950’s partly because he was blind in one eye and the doctors then said the eye strain from accounting work could leave him with very diminished sight at a younger age than if he did something involving less eye strain.
 
You mention that you don’t drive.  Unless you can live in a community (such as a monastery) where there are others around to help you, you may be largely limited to living in an urban area with a solid public transportation system to get you around.  While urban areas may have advantages such as access to libraries and perhaps traditional chapels one can get to on food or by transit, they also will be more expensive for housing and groceries.
 
I mentioned “groceries” rather than “food” on purpose.  I’ve never claimed to be very smart about money, but one thing I learned early on in my 70+ years is that one of the easiest and surest ways to reduce one’s expenses / increase one’s available income for essentials and savings is to buy food in as natural and unprocessed a state as feasible and cook meals from scratch at home.  It would behoove you to learn how to cook, and even garden.  Check out some cookbooks from the library and jump in.  There are also often community classes that one can take to learn these basic life skills.
 
In the current economy retail, hospitality, and service jobs are readily available (at minimum wage, but that is $15.00 per hour in Washington and other states).  I had a part time job as the manager of a small rural branch of our local library system, and the town branches (accessible by public transit) are frequently hiring for full and part time clerks.  I think a library job might be well suited to an aspiring scholar.  In rural areas you might find seasonal work in agriculture but you would have to get to the farms unless you were in walking distance.  In the latter case (living on a farm) how would you get to the nearest town or village to buy groceries and supplies?
 
None of these factors are necessarily unsurmountable barriers, but they are issues that need to be thoroughly thought through and addressed.
 
In addition to the two pieces of advice others gave (develop self-discipline and time management, and determine how you will support yourself) I’ve added: (3) Make sure the eyesight issue has been completely checked out and sorted; (4) Learn how to cook.

I have very poor eyesight( so it’s difficult for me to cook and do laundry- perhaps I could learn to do both ).

Being single, you have plenty of time to both hold down a job AND become a scholar and writer.  If somehow your writing takes off, you could transition to that full time, but unless you come from an independently wealthy family, it’s not a very practical aspiration.  If you work an 8-hour day, you have at least 8 hours a day for prayer, study, and contemplation.  What I would give for that right now. I’m up this late here working my second job and have very little time for prayer and study.

If somehow your writing takes off, you could transition to that full time, but unless you come from an independently wealthy family, it’s not a very practical aspiration.