Free Mobile Advertising Jobs

A new business tax free?
If I decided to make a level in ICT and other skills, then find a job with an average wage, then (bearing in mind I am still working) thinks that the name "solutions" such as putting details such as phone number (my home / mobile), my e-mails and finally a website created and hosted by me at home for free van advertising on my car / help / advice and upgrades with PCs, but without paying tax? It is obvious that I practice reasonable prices cheaper than other computer shops if possible. Is this legal or not?
Well you are either a legal business or other illegal My son has his own computer repair / maintenance / upgrade business and if you are registered and also a tax liability company limited you attract better customers as much as if you try to do illegal people want companies that are legitimate, especially on computers with confidentiality and data protection are important
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