Character sheets will be made and saved within Foundry.
This little mini-site has all of the Dark Matter species, backgrounds, subclasses, unique class (Gadgeteer), equipment, and spells
For character creation, using the Character Creation tab at the top right of the page:
Determine your:
Species
In addition to the species on this site, these PHB species are also part of the Dark Matter setting: Dragonborn, Dwarf, Elf, Gnome, Halfling, Tiefling
Class (Only the Gadgeteer is on this site. The regular D&D classes are used and can be browsed at DNDBeyond https://www.dndbeyond.com/classes )
Background
Determine if you would like to use the Origin Feat from your Background or instead replace it with a Species Feat (listed on the same page)
Browse the Subclasses for what you'll be interested in choosing at level 3 (we'll be starting at level 2)
Browse the Equipment page for weapons, armor, tools, and trinkets. About halfway down is the section which details what each class gets as their starting equipment in Dark Matter.
Browse the Spells list if you are interested in being a spellcaster. It includes the spell list for each class as well.
Important to note: This isn't the only content available. Anything from the regular D&D players handbook is also available. Dark Matter is Fantasy plus Science Fiction.