if you want the cheapest way to minimize the noise coming from your drums...use mutes
paste acoustic boards on your walls, then over it with egg trays. tapos dapat angled yung kisame ng room nyo. magiging parang mic-ed ang tunog ng kit nyo
sorry bro
soundproofing is very expensive, requires a full-on renovation and knowledgeable pros to do the job. acoustic boards and egg trays on walls will not stop bass frequencies and you will only be spending money on things that will not fully solve your problem.
dalee: my advice is to buy this book
http://www.amazon.com/Home-Recording-Studio-Build-Like/dp/1598630342 or look for pdf versions of it. dont buy any soundproofing materials yet, dont even buy your egg trays. read, learn, inform yourself...trust me, this will save you money.