User blog comment:Bakonznator/need help on creating space marine chapter/@comment-2253300-20140822084507

1. Go to 40k Fanon Wiki. That's where you should be posting this stuff anyway. 2. Figure out the dispostion of your Chapter. Writing a Space Marine Chapter is a lot like writing a character. 3. Make sure to create a notable conflict or event for them to take part in. Many people come up with great premises for Space Marine Chapters only for the idea to fizzle out when they can't figure out something to do with them. Coming up with cool stuff for them to take part in should be something to consider early in the brainstorming process.

If you are asking for advice for constructing a force for tabletop then I can't help you there.