Sound treating a home studio room on a budget
I have done as much research as I can. Now, I just need some professional opinions
I have a room I will use as a studio (and a bedroom). It is carpeted, 11ft x 13ft and 9 feet tall. my studio will be in one corner. I have about $300-350 to sound treat it. Nothing can be permanent as I am renting. I record a lot of vocals, guitar, mandolin, bass, dobro, banjo etc. Essentially acoustic stuff. My goal is to maybe prohibit some noise from other people in the apartment complex (no idea how loud people are) but mostly to get a better recording sound. I have some decent mics and I heard this was the best upgrade you could do. I just have no experience and can't break the bank.
Current plan:
about 24-30 something of moving blankets. I will install a grommet kit on each and hang them with heavy duty command strips. 2 Pairs per wall, with anywhere from 1-3 layers of each depending on the proximity to the recording side of the room
https://www.harborfreight.com/72-in-x-80-in-moving-blanket-58324.html
6 pairs of blackout curatins. enough to have three per wall, many folds and creases, and completely cover the room. i have no specific brand in mind, but it would look good and hopefully add to the heavy lifting done by the moving blankets. They would be hung on custom emt conduit curtain rods.
I get that DIYing your own rockwool panels is better, but I don't have the tools and I don't want to transport that later or at least not have the wrong sizes before I get a permanent place. Should I reconsider this?
I also have no plan for the ceiling.
Any help would be appreciated. Are curtains effective? Is this brand good? Am I thinking about sound treatment completely wrong?