I'm obviously new to this forum, but have also looked into just this type of business. Some towns are quite void of natural food shops and it can really be a busy-ness.
Not sure if you're a male or female, but there is a wide range of
start up loans and grants, particularly for women. (watch out tho'
for the funding sources, which can be from the extremes)
If you can start this from home, it can save you the expense of
commuting and paying store rent...and when you grow you can
move to a bigger place. Many shops have a small apartment attached, which would be adequate for a single person.
IMO, if I had a shop like this, it would not waste its space on
tons of vitamin pills...but rather, truly healthy foods. HTH