Hi Quick question, I am very new to unreal and I want to use one of my own models that it rigged and build in blender.
When i bring it over to unreal can I use the default animations that are currently used to animated the manikin that is build with each project ?
Want to know before I get to into my model and find I have to create animations as well
if your models skeleton has the same hierarchy as UE4’s default character you should be able to just retarget the animations without too much effort.
Yep, retargeting will help you with that 
different rigg -> https://docs.unrealengine/latest/INT/Engine/Animation/RetargetingDifferentSkeletons/index.html
same rigg -> https://docs.unrealengine/latest/INT/Engine/Animation/AnimationRetargeting/index.html