Can you give us some more information to go on, OP? Not necessarily where you live, but information such as rent for a decent space, and the amount of taxes collected?
I remember googling coffee machines once and I stumbled into a forum of coffee shop owners (in Portuguese, else I'd try to find it again). There it was mentioned that merely a good machine that would be constantly on would cost around five thousand pounds.
So, think:
What sort of public would you want to cater for?
This determines not only days and opening times, but also the quality of the food and price, as well as the location.
Then start doing the math:
For the weekly time it will be open, will one helper be enough? How much would you pay them?
The coffee machine, ovens, refrigerators - how much does that cost, how often does it break, what's its energy consumption?
Next: where will the food and coffee be served? If disposable, how much would you spend? If reusable, what's the initial amount to buy it, as well as replace it when it breaks and the costs to wash everything?
Now you need a place. How much is the rent, will any modifications be necessary, what will you spend in water, energy, etc?
Alright then, you've got your costs down. Now, how much do you have to earn to cover those costs, pay your taxes and your own wage?
And finally, is that profit achievable?