create ebay listings

Hi- I see ebay sellers who have 50,000- 600,000 items listed. I know they aren't doing these one at a time. I'm looking for someone that knows how to create bulk listings for ebay and put them into some kind of format ie spreadsheet,excel etc. I WON'T be giving out my ebay password so I would need you to create the file and then instruct me how to get it into ebay on my account. This is clothing and shoes,so you would need to create listings with different sizes and colors with pictures etc. I know this is probably simple since I see loads of ebay sellers with loads of items listed. I will send you all the items i want you to create listings for. I will have to be instructed how I load them into ebay. We can try a small sample first say 25 items so we can se how it's going to work. Some items will be auction and some will be store best offer etc. Looking forward to hearing from you. Please don't contact me if you haven't ever done this and aren't an expert,I can't teach you,that's why I'm hiring you. I need an EXPERT.