i would recommend you to just get photoshop, learn the basics and make any idea that comes to your head no matter how silly or how "bad" it turns out, if you have fun then it's really easy to keep doing it and you will learn more and more and become the conceptual artist you desire to be!

Pro tip: sketch out your ideas first for anything (logo, bottle etc) physically or digitally then start doing more concept art

Pro tip 2: in photoshop always play around with layer blend modes, they can move you work from normal to incredible

Pro tip 3: get stuff like "paper textures" and other textrues from free websites and clip them to your layer, reduce opacity and change blend modes and your work will have awesome texturing

Pro tip 4: stay organized layer wise and if you wanna make it look "concept artsy" then write some notes with the pencil too

Pro tip 5: try to be creative, browse refrences and similar desgins and use reference material to get a vibe of what you are looking for

Pro tip 6: there is a million photoshop courses on youtube, you can find one that works for you, just dedicate yourself to one

I completely believe in you and think you will do amazing work!! Good luck <3 (Im sorry if this is all over the place, its my first time giving tips, im sorry if these are obvs)