The 25k€ of the GmbH don't necessarily have to be cash or cash equivalents, they can be as well the building/car/whwatever you use for your business (well in fact: some things are not excepted. I don't know the exact laws.), long as it is equity. So you can't count a bank loan to these 25k. These 25k have to be your own.
Note: At the beginning it is enough to have 12.500€ equity, but in this case you have further 12.500€ liabilitys in your private area.
If I have a Mini GMBH by what amount am I liable to ?
Only the equity you invested + earnings you make - the sum of money you distributed to you self and other shareholders.
What is the cost of setting up a Gbr, Mini GmBH, GMBH ?
Again it depends... For the Mini GmbH and the GmbH you always have to pay a Notar, so it is more expensive than the Gbr. Hopefully someone else can name you wild guessings
