Hi Loky! Welcome to IIS!
Binoculars are a great place to start. 20x90 is quite high power and large aperture. That is, they are big and heavy and can't be effectively used handheld. You'll need to get a big tripod to hold them securely, or make a parallelogram mount.
There's a few articles about choosing binoculars and making a mount in the
Projects and Articles section. Have a read and keep asking questions. I'm sure some other bino guys like erick will offer some advice too.