I usually just make a rig up out of mono and tie the braid to a swivel at the top of the rig.
Some of my mates tie their leader to the braid using a bimini twist knot and then wind it on to the reel. I just hate the sound of the knot going through the eyes of the rod when ya cast.
Also some of that cheap stuff is really thick. and pretty shit. I bought 1000m of 80lb thinking it was a bargain. Turned out to be like string.
Theres a bit of an article here on braid ==> https://fishingmag.co.nz/deepseasuperlines.htm