The amount needed to start mining depends on several factors, including the cryptocurrency you want to mine and the mining equipment you plan to use.
The initial capital or the actual base fee also depends on some tools or speed power that every miner wants, when someone focuses on Ethereum most of them often use Rig Mining and use some powerful processors to do mining like this, but if you take Bitcoin option for patching most of people use ASIC, because it is more effective.
ASIC itself is a tool that requires expensive costs and great power, because it involves commensurate electrical power. With regard to electricity, of course, it requires costs, and from this point of view it is also included in the calculation of a miner's capital. Local electricity costs must be considered when wanting to carry out mining, because this is also a factor that involves mining costs.