Affiliate Marketing Secrets

Hi. I’ve just set up a new blog and I’ve written an article about some great little products which I want to place images of amongst my text. It’s not like I’m going to be passing these products off as my own – I’ll be explaining where they come from and will even include a direct link to the page but I don’t know if this is allowed without asking the company for permission. Eventually, I’ll be adding affiliate links etc but until then I’m thinking it’s just easier to copy and paste into the blog post with full credits if this is permitted/legal? Thanks for your help.