The Chado schema heavily relies on Ontologies to integrate different datasets. Therefore it must be the first to load.
Inside the extras directory, there's a file named sample.tar.gz that might be helpful. It contains a few small FASTA and GFF files, together with a README file with examples of command lines.
.. toctree:: :maxdepth: 2 :titlesonly: Ontologies <load_ontologies> Taxonomy <load_taxonomy> Organism <insert_organism> Publication <load_publication> FASTA <load_fasta> GFF <load_gff> Feature additional info<load_feature_annotation> Blast <load_blast> InterproScan <load_interproscan> OrthoMCL <load_orthomcl> RNA-seq <load_rnaseq> Coexpression <load_coexpression>