Most of the time, something is better than nothing. For our style we tend to use longer blades and handles, so it gets harder to find suitable weapons. One of our senseis in Michigan in the US makes bokken and training knives for us. You can reach out to Randy sensei, he may have the links. As far as uniform goes, a kaku obi is strongly recommended. It's wider than a normal karate belt, and will hold weapons more securely. A hakama may be wanted eventually, as it goes over the obi and helps secure belt items even more. Ebogu is a good site to start on. If they have okatana or (n)odachi, they're usually closer to the right size for us. Their stuff is usually decent quality for the price, which isn't cheap, but isn't outrageous, either. There's no rush though. Like I said, something is better than nothing, whether it's a prop, a stick, a broom handle, or an empty hand at the end of your arm. Especially when starting out, the tool matters less than the movement you're doing with it.