I would also heavily recomment to start with a simulator first!
you dont even need to spend money on it. My two favorite free sims are Multiflight:
https://www.multiplex-rc.de/service/downloads/multiplex/software.html for PC
and Pica Sim:
https://play.google.com/store/apps/details?id=com.rowlhouse.picasim&hl=en_US for smartphone and PC.
On the PC versions, you can fly both with keyboard and USB Controller, which you normally can get very cheap from china. The touchscreen on the smartphone version also works OK enough to learn basic stuff. When training with a simulator, practice LANDINGS! If you can land safely, you can also fly safely! Also, try some 3D planes on the simulator, they are very responsive, that will teach you to use only small inputs, and 3D manouvers will teach your orientation, which is one of the key skills you need to learn. Try to think youre sitting in that airplane, that will help with orientation. Practice is important! You wont learn it in one day, but once you got it, it will become more and more easy.
If youve almost zero flying experience, wait with your slender delta! Its not super hard to fly, but its very different from a normal airplane. The same problem has the FT flyer, and even Josh bixler says this in one episode.
Start with something conventional! You can also build it yourself. You already have electronics, so get some of the lighter foam and get started!
I would recomment building something like my first airplane first. This was my first plane:
View attachment 122010
First, I was sceptical, but it was one of my most used and most fun airplanes. And I think this kind of plane would be perfect for you to learn! It has the motor and prop well protected on the back, but unlike many pushers like FT explorer, this one has ailerons, but no rudder. You will quickly get used to ailerons, which you will need later on your deltas. Also, this gives it some kind of jet-like feeling, which is very cool. Try to build something like this out of foamboard, it is a conventional plane, so if your CG is correct, which is a lot easier on a straight wing, its very unlikely that your plane doesnt fly. If you can control your plane right, try spot landings, they are perfect to increase your flying skills fast.
Even if this way is longer, it is way more enjoyable. Set yourself small goals, so you can reach them. If you learn your skills first, you will have much more fun building and flying your dream planes later. We all learned a long time.
If you go step by step, your fun will be much more in the end! And you can always build your dream planes later!
You wont have fun if you put your goals too high! Just keep on going an practize, its the best way to success. Noone of us could build and fly perfect from day one!