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Im a fairly new player to 40k and I mostly play tyranids and SM. I am working on a cheatsheet for these two races just to keep things organised, there are so many rules and phases.

Is there anyone willing to share their cheatsheets to help me along?

Try here:
http://www.dakkadakka.com/dakkaforum/posts/list/597998.page
It's currently 3/4 of the way down this page.

Also, look for Battlescribe and other apps to help get your lists legal.

Jeez haha, I wish I had that cheat sheet when I started (and I still might use it, can never remember stuff like the perils table).

Definitely consider using battlescribe though, it's great for coming up with lists quickly and is really easy to switch things around. It's still a good idea to run your final list past your codex to make sure everything is right, but I don't think I've hit any major mistakes with it before.