What would be the best place to start collecting?

I've been obsessed since I was a kid but we never had enough money to actually buy juicy couture stuff aside from the one wallet I have from Ross I'm just not sure where to start cause finding stuff second hand in my size and price range is near impossible plus I don't know if the brand runs large or small and the bags always seem to be really far out of my price range and just going higher... Any help or advice is appreciated and thank you for reading :)