Help - starting a new company

[abhisheks9]

I hope this not irrelevant topic here.
And strongly believe members here specially working as self-employee will guide me better than any professional.

I am working as employee, but recently got interested to register a company of my own.
I know where to start i.e. Company House website: companieshouse.gov.uk, but i need more clarity which i am not able to understand through the website.

I don't intend to do anything on my own sooner, so need to know if is it mandatory to have accountant, business account in Bank or can manage on my own? It might be case that i may not anything at all, will this be a problem?
it doesn't mean i won't even try anything, but want to do on my own, but looking at riskier side if company remains dormant.

In short: i got no knowledge and need better understanding.

Thanks