Good morning Malc
If you are registered for VAT and your taxable turnover is above the VAT registration threshold (currently £85,000), you must keep digital business records and send your VAT returns to HMRC using MTD-compatible software. For the vast majority of businesses this applies to accounting periods starting on or after 1 April 2019. If you are below the threshold and continue to be below the threshold going forward you will not be affected by Making Tax Digital, unless you voluntarily sign up.
VAT is a self-assessing tax, so please follow the guidance included in these links
MTD for VAT
VAT Notice 70022