I adding products into magento I will use open source MAGMI software. I will install MAGMI in you system and prepare data sheet according to the excel sheet data provided by you and upload them in bulk within few hours of time.
Once I install magmi on your system you can use this to upload further product in the future, and you can easily update other information like price change, stock change in a jiffy.
Looking forward to work with you and make your product adding to magento work much easier.