looking for lots of advice

[couldb]

hi to everyone on this site.i have just started doing mobile pc repairs where i can come to the customers home or office and repair there pcs or laptops,,,i dont charge a call out fee and there is no fee if i cant fix the pc.sometimes i may have to take the pc away to do the repair or upgrade and there is also no charge for the collection and delivery back.
I have been offering this service just to the public and on a part time basis as i do not have enough work to give up my job although it is growing every week.
could anyone give me some advice on how to approach companies to offer them this service and what i should be asking i really would like to do this full time and cover a larger area i am based in essex thanks
my email is ezepc@fsmail.net