You pick a "name value" and number of shares when founding, for example £1 x 500 shares. This is the "share capital", and official maximum liability of the founders for the company's debts. It also defines the smallest unit of ownership that can be assigned to a person. But of course the actual starting investment, assets, and the market value of the shares can be much higher.
Estonia doesn't use the concept of "number of shares out of total shares", but instead "euros of ownership out of total share capital". For a typical small business you would set it to 2500 EUR and can split ownership at 1/2500 granularity.
It's just a matter of how you want to structure the balance sheet.
You can have 2.5k€ share capital and 97.5k€ free capital. This is usually a better arrangement than having it all in the share capital which is "bound" equity. (Bound is probably not the right English word for this — I only know the terminology in Finnish.)
