Will I Pay Any Interest On My Credit Line If I've Zero Balance?

depends on how often you pay off principle and how much dollars.
and how often you are charged interest.
fv=pv*(1+interest rate)^n n being the term of interest
so lets assume you pay zero off it and interest is calculated daily
fv=6300*(1+0.015/365)^365
interest = fv - pv
= 95.21 for one year without repayment
if you were to pay approx 25.15 a week you would pay this loan in 5 years time and pay approx $240 in total interest over five years
EXCLUDING future interest rate increases over the five years and excluding bank fees like account fees or account manage fee or setup a loan fee.
You could create a spreadsheet each day and calculate the interest as annual interest / 365 for the daily calculation
Then add the account fee onto the balance calc + any set up fee onto the start balance. by using =a$5 for the repayment on all rows as an example you can copy it down and the cell number will always be a$5
this way you can alter a5 and the repayment alters all the way down each week row.
or just download a template for excel
https://templates.office.com/en-us/Loan-amortization-schedule-TM10073881

Call whoever you owe the money too, and tell them your situation. Ask them for help.

In case you do not have an outstanding balance to your business line of credit, then no obligations are due.

No. Capital loan doesn't have annual pay down requirement, unlike a lot of lenders.

No. To the nearest cent, the monthly interest is $162.50. The monthly payments only pay the interest, without reducing the principal.