Setting up iphone repair business?

I want to start advertising iPhone/iPod repairs. I have fixed many iPhones and iPods, but just for friends and family with no real profits.
This has lead me to thinking I should maybe set up a small company and advertise iPhone/iPod repairs. I know that many people after smashing an iPhone screen think that it is going to cost a packet to get it repaired. I will be able to fix a broken screen (for example) for approx. £20. if I charge £30 labour, then do you feel £50 is an acceptable quote for a broken screen?

iphone reparasjon