I think for blog spot not require to make sitemap. Just create Google webmaster tool account place meta verification tag at google head section and verify it.
atom.xml and rss.xml are working on google webmaster but it's not working on bing webmaster? What is the problem?
nice sitemap its very helpful the blogspot needs site map you can find it in robots file that you can edit it as this
Use the atom.xml feed. You will have to submit this feed to Google sitemap. Your posts will get crawled in no time.