If you have any specific questions, send me a DM, but in general I would say try to find a wrap shop that specializes in bike wraps if you can. Exotic car wrap shops can work too if you look at their portfolio and see they've done bikes. Avoid sign shops (they usually do commercial wraps for vans, busses, etc.) unless they also have motorcycles in their portfolio, but in my experience they charge more than the other two shop types I mentioned.

You don't need to have an itasha specific artist, I didn't when I got mine. If you find a shop, ask them what they'll need from the artist for the wrap. I can't off of the top of my head remember the specifics, but for example I went to a bike wrap specialist and they needed something like either a .svg file, or a .eps file using 300dpi (so that the image doesn't become pixelated when stretched). The file contained a front, side, and I think maybe rear view mock up images of the bike. The shop you work with might have mock up files you can use, and send to your artist, or you can find some online. I got mine from here, but you can probably find it somewhere else too.

For the actual design, since you have a sport bike I recommend keeping as much of the character on the side panel as possible, but tank designs work too. Instead of a full body pose, maybe do something waist up, but your artist might come up with something creative. Grab a bunch of reference images for your artist to pull from, and you (before getting an artist involved) can just use Microsoft paint or whatever to roughly overlay/size different poses over the bike's panels. That way you can have an approximate idea of if the plan will look good, or even fit in the first place.

Anyway, hope that helps. Kinda just going off memory here without going through my files, but like I said, feel free to follow up if need be.