Being an SEO guru will certainly help to make your stand out from your competitors!
As you are not sure which products you are interested in selling, I have just listed a couple UK-based drop shippers you can check out.
Sometimes when you look through the items they are selling, you get some great ideas on what to sell.
Clothing: Link hidden: Login to view
Bit of a mixed bag - jewelry, fragrance and home ware: Link hidden: Login to view
Giftware, toys and home ware: Link hidden: Login to view
I hope that helps :)