Need help and info on launching ecommerce children's decor business.

I am knowledgable of the ecommerce side but need more info on design, fabrication, workroom, textiles, etc. I have ideas on paper, and have found a seamstress to create prototypes. I also want to sell children's accessories that coordiante with bedding, (lamps, picture frames, rugs) but am not sure of the wholesale, resale, buyer/seller end.

I understand that overseas manufacturing is less costly, but I need to go that route? If so, how do I locate a manufacturer overseas?