Hosting a techno dance party is more complicated than hosting a regular dance party because with techno music comes a very specific subculture. There are specific features that are expected to be included in a techno dance party. These are features that should be primarily incorporated during your decorating.
The most crucial feature of a techno dance party is techno music. What one person considers to be "good" techno music may be quite divergent from another's opinion, so the specific music is up to you as long as it is, indeed, classified as techno. You could find local DJs who enjoy spinning, or look into artists and groups like Ratatat, Big Gigantic, and Diplo for inspiration. If you're nervous about your music selection, you can ask your guests to participate by suggesting bands or songs, or by bringing their own mix CDs.
Techno dance parties involve a lot of dancing, so ensure that the layout of your party is conducive to this. Move furniture around to ensure that there is one large space instead of several small spaces. Dancing to techno music is best when the crowd is tightly packed together.
How you decorate your techno dance party is surprisingly unimportant because most techno dance parties take place when it's quite dark. If you can, turn off most of the lights in the room (don't turn them all off so that your guests can have some sense of what's around them). If you want to take your techno dance party to a higher level, rent or purchase lasers to cast laser designs on your walls and ceiling as the music is playing. You could also include a strobe light in your decorations.
Give all of your guests glowsticks upon arrival for them to dance with. The darkness of the room will make dancing with glowsticks fun and entertaining. Ensure that you give your guests plenty of space, however; some people like to move their glowsticks around a lot, and too little space will cause your guests to hit each other with the glowsticks accidentally.