Don't do it OP.
I own a shop - have done for 7 years - and am slowly winding it down. (If you advance search my user name you will see that I have posted on threads about high streets etc before).
This is going to sound horribly negative, but this is my experience talking! Here goes.
Your idea is lovely, but you say you have a high student population. They will only be in your town for probably 35 weeks of the year. They are also notoriously tight with money as they don't have any!
Pensioners are very tight with money as they are terrified of not having enough to fund their care when they are older.
Young families talk the talk but when it comes down to it they go and shop in Primark and Aldi, not in the independents.
People bang on and on about how they want a thriving independent high street but when the chips are down, people want the cheapest option. The cheapest option usually means the smallest possible markup for the retailer.
You say you earn £42k part-time. You will not earn anything like this amount with your idea. You cannot run a shop on a part-time basis; at the bare minimum you need to be open Monday-Saturday (you could possibly be closed on a Monday or a Wednesday but if people come to your shop and you're closed, they won't come back). So many times Ive read on here the fact that people don't shop in independents because they're not open in the evenings or on Sundays....
The actual costs you will incur will be:
- Rent
- Business rates (you can find the rateable value on the letting agent's details - then you can cross-reference this on your local council website to find out what the actual business rates will be)
- Refuse collection (businesses have to pay separately for this)
- utilities (these are charged at higher rates than residential accounts) - electricity, water, sewerage, internet, phone...
- Possibly maintenance for your premises - many business leases are what is called partially repairing or fully repairing leases. Google these. You will be shocked
- depending on where you are, there may be other tariffs/taxes to pay to your council based on your rateable value or your turnover - do you have a BID (Business Improvement District) that you'd need to pay in to?
- insurance - buildings/contents/public liability / employers liability
- staff costs - wages, pension * these are huge even if you're just paying minimum wage *
- accountant / payroll (I do my own book keeping but I pay an accountant to file my tax return)
- stock
- shop fittings, equipment etc
- marketing costs - you'll either need to spend hours and hours per week on instagram and facebook, or pay someone to do it for you - plus possibly flyers, advertising in local magazine etc
- website
- tax and national insurance
Once you've factored in all the above, you then have your profit, and this is where you can pay yourself your own wages (that is, if you're a sole trader. If you register as a limited company, it will be different and you will probably take dividends and then pay tax afterwards). The most important piece of advice I was ever given was by my accountant who said "don't forget to value your own time adequately"
You will face constant criticism from customers who walk into your shop and don't like what you're doing/selling. You will need to be really nice on all your local facebook groups and not disagree publicly with anyone. You will need to be really nice to the local business groups / community interest groups / every man and his dog in order not to get any bad reviews on social media. You will end up working many many hours per week and earning about £1 per hour after all your costs are covered.
You work part time for £42k. Enjoy it!!!!!