If you have just started operating as a limited company, then you will need to start managing your tax differently than you did when you were paying via the PAYE model. If you have employees then you will also be responsible for organizing their tax contributions as well. If you’re new to all this, then the best advice I have is to contact a professional to help you to get everything on track. When it comes to running a limited company, tax matters can become convoluted.
When I first started my company, I contacted a firm offering accountancy in Essex for advice. They helped me every step of the way from registering the company for PAYE to managing my year end statutory accounts. It may be possible to handle it yourself by piecing together information but this will probably be time-consuming and it may be easier to hire a professional.