Guys! I love you to pieces, but please don't email/DM me asking how to get freebies from brands. I used to get maybe one or two a week before, but now that I am more active on Insta, I get several of these every single day.
Once you have an established blog and/or online presence with a solid following/engagement, the brands will flock to you. Be present, be passionate about what you do, and strive to constantly improve, that's the best advice I can give you.
Personally, I have not reached out to a brand in years. When I first started Glamorable, I mostly blogged about products from my own stash until I finally got noticed.
If you want to collaborate with a brand you love, find a contact page on their website, and send them an email. Introduce yourself, your blog or Insta, and provide some meaningful metrics that the brand might care about (avg likes per photo, monthly pageviews, avg views per video, avg story views, how fast your channel is growing, etc). Don't fret if you get rejected or never hear back, keep trying and someone will say yes. Best of luck!