Definitely get someone with experience in this area involved, your accounts wont be much so you could try and attract some pro-bono help from a local accountant (and offer some positive PR) or have a look on accounts group
Consider asking someone to become a non executive Director or mentor etc etc, bound to be a few accountants in your wider network that would love to help
Best of luck
Yes, you do need some professional accountancy advice, all of your questions are very sensible and will be addressed by the right person. I have several CIC clients in your position and can offer the correct, timely advice to assist. Please feel free to contact me, but unfortunately as I am based in Doncaster it isn't conducive for a meeting. As John says, I am sure there will be accountants in your area able to assist, but please ensure they have CIC experience.
With very best wishes for your future venture,
The accepted company tax/fiscal year runs from 1st April to 31st March, corporation tax is due no later than 9 months after the end of your Chargeable Accounting Period (CAP) the tax return (CT600) is required no later than 12 months after the end of the CAP, keep in mind a trading profit is not a taxable profit (seek advice) any salary you draw from the company will need to be reported on a self assessment tax return.