In order to import a new genome assembly and annotations using EasyImport, you will need to have a local database server set up with at least one mirrored Ensembl/EnsemblGenomes database to use as a template. The simplest way to do this is to use GenomeHubs containers by following the instructions in the Quick start guide.

The only requirements in terms of data are a fasta format sequence file for the genome assembly you wish to import and a .gff3 annotation file containing gene models (strictly speaking, it is possible to import only sequence data so the .gff3 may be considered optional, though the resulting Ensembl database would have limited utility).