first,you should rename the first page to be index.htm or index.html .both of them are ok.then upload them to geocities.
next,you should also put all pictures,sound you want to show to the same folder of index.htm or index.html.if you dont ,your photos and sound may not be show correctly.
i suggest you use ftp software to upload the file to geocities¬
參考: my experience of dreamweaver and yahoo geocities¬