Need to upload 100 to 500 Products for Online Retail Website

I am a proprietor of a startup company located in India Mumbai in the midst of setting up my website. I am in need of resource to list and update my backend ecommerce system anywhere between 100 to 500 skus which i will provide. Once i provide you the sku i need i would need the following as output.

Product Description short
Product Description long
Image Short (30x30 Pixel)
Image Large (640 x 480 px)
Manufacturer specs.
ETC

I will provide you access to my backend. Since i am a startup i have low budget as of now but am sure to make it big and would like to continue with someone who has experience to do such work is a go getter. I anticipate that it wont take more than 5 mins to upload one product on website. Please provide your bids for me to choose and also any past experience welcome.