First, it pays to install your requirements first, making this method easier. Organize your mods folder by 'date modified.' Find the date you started adding these new mods. Use the split-stack method. Pull out half of the mods you just added, then run the game. So long as you make it past the glowing green trails of the logo screen, you will know it works. The game will usually crash before the game information is shown. You do not need your headset on to run and heck mods. When your game crashes, focus on that half. Split that half once more in half and try again. Repeat until you find the problem child. Once you locate the problematic mod, make sure you installed all of the requirements displayed in the mod's description. If the issue continues to persist, check the Posts and Forum tabs. If the problem is known, the creator will often pin the post that has the most recent fix.