You can get ratcheting straps at Canadian Tire, and they are not very costly. I recommend you use four straps, so the bike won't fall if one loosens. I have pulled lots of bikes, from 125 to 1100 cc, between GTA and Florida, and none has suffered any damage, so it appears I lash them down well.
You need a strong cross-member in the trailer, so you can run the bike forward to it and it will keep the bike from going forward. It is good to have rails each side of the tires so the bike can't slip sideways.
I agree that front straps should go around the triple clamp, a big hunk of strong metal above the front wheel. If the hooks at the end of the straps do not fit there conveniently, also get strong nylon loops, then put a loop over the clamp and a hook in one or two ends of the loop, depending on how you affix the loop. Find or make a strong tie-point in the trailer, ahead of the front axle, and about a foot out to the side of the bike. The straps must pull the bike forward and down.
To make the ratchet work right, start with the ratchet fully open and the strap running freely through it, then draw the strap nearly tight. Start taking up the slack, first on one side then on the other, then keep tightening until the front suspension is [almost] fully compressed. Then find a strong point behind the seat or above the rear wheel, and run some straps to tie-points out to the side; these may be ahead or slightly behind the place where the strap attaches to the bike. These do not need to be as tight as the front straps.
If you like, you can give your trailer a name, but that name will probably turn out to be Lurch. All the trailers I have known have used that same name, which they all fully deserve. Good luck.