How to process Multispectral data from a DJI Mavic 3m

Hi.
I’ve been using Pix4d mapper for a few years now and have recently been asked to fly a new area with a Mavic 3m and process so the client can get a merged georeferenced colour aerial imagery, together with an equivalent digital surface model and, if you capture IR imagery, or could provide a filtered digital terrain model as well that would be great.
So does any one have a step by step process to get these result? Thank in advance.