First, get the clear picture of what you want from the ships.
Are they huge on armor or shields, slow or fast, dangerous in small or great numbers, use many abilities across many or few ships, use few abilities across many or few ships, etc...
What weapon systems do they use? https://forums.sinsofasolarempire.com/387547/page/1/#2680679
Write up some info about the various frigs and cruisers, then capitals using above info: some weaponry info, abilities, etc... that could be done up in entity files later.
Second, draw up some kind of tech tree layout -I use excel to block things out and draw arrows to link.
Civilian: 3 blocks revolving around Culture/Space Travel + some civilian modules, Planet access + improvements, resources + maybe trade/refinery.
Military: 3 blocks: ships + abilities, defenses, weapons
Fleet: use an existing race as base and custom stringinfo names/descriptions
Defense: 1 block for all things starbases and perhaps your tactical stuff
Third, look over the reference files and how ships, modules, research are put together if you don't know already. Figure out which areas are a total mystery to you and recruit people to fill those areas. If you don't know what you know, how can you ask for others to help in them?
Get this kind of stuff written up in your main post to show you've got ideas, what stuff you can do, what stuff you need help with, and good luck. An interesting story or blurb is just that until you start working on it. At least get some foundation material out then figure out how to make it all work.