Firstly it's very daunting at first but once you have done it you will feel so much more confident.
To address your third question - dsound allows you to upload the same song again after 7 days. It will generate a new URL with a time stamp in it.
Also I know I'm biased as it is my website but if you really want to get your music heard then get it on Musicoin and then add it to AtomCollectorRecords.com :-) You will be a amazed at how many people listen to your songs.
Add dsound & Musicoin tracks and get more plays!
Follow @JuxtaMusic for More Of My Music
i was wondering about that ... you'd have to manually reupload your track or it does it by it self ... and been meaning to check out your site...swamped ...ill check it soon tho