Ok so I looked at this blu you got, seems easy enough, tho I never liked pen style vapes, so I'm biased

But from what I read this is made to vape juices of 50vp or lower, if you go higher it won't work properly. So keep that in mind. If you'll want to try 60 or 70VG you might need another device. But other than that you can use whatever juice you want.
Also, I was just checking, but coils for lets say vaporesso kit sky solo (thats the one i checked) come cheaper than clearomizer for blue pro. It's a bit more fiddling but imo worth it. It also has better reviews.
While you're waiting for your juices to arrive, go researching. Read some guides, watch reviews on youtube. Read on differences between pens, pods, stick mods and box mods, between vg and pg, mtl and dl. You'll figure out what works for you, don't worry