Credit Card Balance Transfer Questionw.

I live in the UK and have £3k on a CC.

I've been accepted for a balance transfer CC with a limit of £7.5k. The card is 0% balance transfer for 36 months with a 3.15% for shifting the debt.

So once I shift the £3k I still have £4.5k limit.

Is any new spending in the 36 months also 0%?

Do I just pay the minimum off every month to avoid interest or do I have to pay more?

Thanks.