Just find the 1 product that you want to start with. I would recommend something that you can offer upsells or varaiations.
Take that product, find out how you want to brand it or make it special to you.
Go to AliExpress, find samples.
Talk to those same vendors on Alibaba and ask for free/low cost samples. Don't negotiate until you get product.
Highly recommend talking to them via Skype (Phone/Video chat). Build a relationship.
Once you find the product you like, negotiate.
Start with a small inventory
Figure out where you want the ship the product from. (In house or through a 3PL or even Amazon FBA)
Figure out how you want to sell it as far as shopping cart (own website, amazon, etsy, etc.)
Generate traffic to shopping cart
People will buy
Re-invest money to buy more product at lower costs and higher quantity
Build large e-mail list
Remarket next product to e-mail list
Repeat
If you have any questions, let me know! I ran an ecomm business years ago, and now have a marketing agency. I can help where needed!
ralex at innovatefast dot com