Question about spoolng new reel

[Don Jones]

Hello!
I am happy to say I just acquired a new Avet SX MC reel and need to put line on it. Probably looking at 30 or 40 lb test braid for "all purpose fishing".
Manual says it holds 570 yards of 40 lb braid. Yikes!
Should I put a mono backing on it first and then the usual small spool of Power Pro (or something similar?) (150 yards per spool I believe)
How do you know how much mono to put on first if that's the process.
Can't see loading 570 yards of braid.
Looking for tips here!
Thanks guys!