Whoa, whoa, whoa, LOL.
Seriously, if you want to evoke him safely, don't use any name to evoke him by. Say for example "I evoke you by the divine". You don't have to evoke him by any name other than his own (IMG:
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Bym gives great advice on this stuff, but if you really insist on doing it your way, PLEASE get something like Van Van oil, or a banishing incense that doesn't rely on any gods. Check my signature link for some great stuff, or do this at least:
Get a bottle of water, put some salt in it, mix it up and put it in a spritzer. Spray a couple bottles of that all over your house. After that, get some frankincense and burn that all over your house as well.
DO NOT use a paper seal! At least go to an art supply store and get parchment! OR, get a square of leather, draw the seal from the PETERSON edition of the Lemegeton (you can find it at esoteric-archives.com) and draw a double circle around that, with the name around it. The seals from the mathers/crowley edition are not that good. This works VERY well. OR, even better than all of that, get a square of silk and draw the seal on there. Silk works really well for this, and they love it.
After you try the evocation, if you get the van van, put a few drops of that in a spritzer of water, and spray that around your house. If you can get some also, mix the water 50/50 with florida water.
And one last thing: Don't try to make your own van van, the recipes online are crap! Get it from a good hoodoo practitioner (lucky mojo is not that good).
Good Luck!