Accounting help

I'm looking for someone to give me as much advice written down as possible regarding my new dog walking business I set up around 3 months ago.

I use Quickbooks at the moment as suggested by other dog walkers but I'm not entirely confident I'm keeping up with everything I should and I get worried I should be paying things like tax, national insurance etc.

I'm also not entirely sure how to work out my tax return when the time comes so I'm just looking for as much advice as possible to be able to do things by myself properly and legally.

Hopefully this is something you can help me with!

Kind regards,
Katie.