The first thing you must think of when going about designing a ship is what kind of ship do you wish to create and does your character have the resources and knowledge to be able to construct such a vessel in the story. Designing a ship your character has no chance of being able to actually acquire in the role playing setting will be a waste of time and actually detract from the story. What you must remember when designing a ship is that it must be balanced and follow the allowed technology guide based on your character race and location. Trying to construct a titan class vessel in a star system that has no orbital shipyards or skilled shipbuilders is obviously impossible, more so if the most advanced culture in said system only has stone age technology.
When it comes to ship designs there is two routes you can go, one is that you can design your very own ship on paper and therefore choose exactly how your ship will be from the ground up. That choice allows for more control but also requires alot more effort and though as you are now designing a one of a kind vessel. Another route you can go is choosing an already made ship design from your favorite sci-fi show, this allows for a faster design process as the general information is already there and all you need do is switch some things out if you like to different technology. Using the second option is not only faster and easier, but now you also can find an already made picture of it instead of having to make one of your own.
Step 1: Pick a ship class you wish to make, choosing any modifications you wish to add to the class and the general size of the finished vessel.
Step 2: Confirm that you have the technology, resources and infrastructure needed to construct the vessel. No point going further with the design if you cant even built a ship of that class and size.
Step 3: What are the general characteristics of the ship. The type and amount of weapons it has, the number of drive systems and defenses for example.
Step 4: Confirm that the ship design and size can support the devices you wish to install in it, does it have enough reactors to power said devices, will they all fit in the hull with enough room for all that needs to be installed for normal operation.
Step 5: Using the ship specification template, begin filling it out with what you wish your ship to have based on what you are allowed to have based on race, location and technological development level.
Step 6: PM your design to the admin or mod that is in charge of approving ship designs. To keep things fair and to prevent god modding, you must have your designs looked over and approved before you can post them.