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I am trying to create a custom Space Marine Chapter only I do not know what chapter I want mine to be the successors of. I am not sure what the tactics of the main chapters are to an extent. I was leaning towards Dark Angels or Blood Angels. I want to have my own squad formations and organizations although I will accept codex formations and rules. I want to focus on xenos like tyranids, orcs, and daemons. Emphasis on daemons. I was hoping any Space Marine players could give me some insight. Thank you.

This is a pretty good guide to designing your own chapter.

http://www.bolterandchainsword.com/topic/132379-guide-to-diying/#entry1520507

I'd suggest you only write fluff and avoid rules as your opponents might not be amenable to them. Other than that, avoid turning your chapter into a Mary Sue and you're already half way there.