Its very dangerous to use braid without a decent length of mono wind on leader. Nothing worse than catching something bigger than expected and trying to control it next to the boat and holding a handful of braid. It will cut your hands to shreds.
Use at least a rod length and a half of braid, and up to twice that or more.
A double uni knot will run through your guides (lumpy but will run through). An Albright knot will put the tag of the knot in a more favourable position for running throught he guides, but albrights tend to slip.
Improved allbright knot is a bit better, but a double uni won't come undone.
All a balancing act.
cheers