Start a MSP and bundle on cyber security as a service to get a client first make sure you have a solid offering and test how you will deploy it get some marketing and business cards have a website that can convert people into leads and then attend local networking events just google "networking area" "business networking events area" I would read MSP in 30 days
and engage in social media mainly linkedin and connect with local business owners
I recommend reading or listening to. Manqged Services in a month. https://www.amazon.com/dp/1942115474/ref=cm_sw_r_cp_apa_i_6IJGFbADZDD6M
join us r/msp if you do not know what a MSP is i highly suggest you follow the sub Reddit. I would also read https://www.amazon.co.uk/Managed-Services-Month-Successful-Consulting/dp/1942115474/ref=sr_1_1?keywords=managed+services&qid=1569417482&s=books&sr=1-1 and I have no idea about the LLC compared to the UK . I would say register your llc over sole trader