yeah, if you're going to mod Skyrim, best to cozy up to NMM (Nexus Mod Manager) or MO (Mod Organiser) and as Brad mentioned jsut above, get LOOT which pretty much sorts all your mods for you in a way that they all play nice together. If not, some or many could conflict with each other and its nothing but CTD. TESVEdit and SSEEdit are also godsends when it comes to troubleshooting crashes. It looks at your mod order and if there are any conflicts that are causing crashes, it'll tell you which mod. Most times, it's just a case of using LOOT to manually tell "mod X" to load before/after "mod Y."
It's all pretty automated for the most part unless you get into merging mods, which i've never bothered with, but the tools mentioned thusfar can get you up and running pretty quick.