Hey everyone

Im new in the forum and i haev some questions that i hope you could answer me.
I have a budget of 1500$ and i was thinking on getting some acoustic treatment in my home recording studio cause I'm really starting to record allot lately.
Im looking or something really really good and is tehre something that i can put in my room beside the acoustic that will make the room soundproof? (cause ive been told that acoustic and soundproofing is a different things).
Im looking for some good cables too and maybe ill buy a michrophone shield.
I really want to buy a good synthesizer and earphones,so please tell me waht you thinking

my room is very big one wall is 129.1ft² (square feet) and the other one is 64.5ft² (square feet) and then theres the door and the window.