[Pauleye]

How do you suggest I do it? Do I tie braid directly to the spool, put tape around the spool arbor first, or start with a few wraps of mono?

[Sea Duck]

Many reels are "braid ready" as the spool has some kind of soft backing or the machining done to the spool, such as ridges, to grip the line. Check the manufacturers suggestion, but if in doubt, start with 10 or 15 wraps of mono.
Braided line lasts a long time and some of it is very expensive so as the part that sees the water gets frayed, if sections are lost from breakoffs, etc, you will want to remove the braid, add some backing and reuse what is left in order to keep your spool full to the lip.... eventually you will be adding backer to it anyway so it cannot hurt to start that way unless you insist it be all braid. If you start with 300yd and throw it away if you lose 50 yds, then you can send the remaining 250 to me.
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Herring?

[Pauleye]

Thanks, I'll check the spool and use mono as you suggested

[PECo]

On spinning reels, Shimano makes the following suggestions to prevent braided line slippage on the spool:

[Michael]

I started with mono and then use the uni to uni knot for the braid.

Check the manufacturers website to see how many yards of mono and braid it holds so you can do some math on how much mono to spool before going with braid.

[fishfinder]

I use electrical tape around my spools and fill with braid and when its time to add more I cut back on the existing and uni to uni some more. After awhile of that Ill flip over the line and add some more braid 7sing the older inner braid on top of the new stuff.
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There's a fine line between fishing....

and standing on the shore like an idiot!