C&E checklist

Mention that-

Scouting is banned
The link to the C&E rules ( http://pstournaments.weebly.com/campe.html )
Battles have to be played in gen 7 OU (Unless you're hosting a variation, like a monotype C&E, in which case battles will be played in gen 7 monotype)


Mention whether-

The players get rerolls, and if so, how many rerolls
Z-moves, Sturdy, Focus Sash/Focus Band, (other items here if any) are banned for the first round
Megas and alolan formes count as a separate evolution or not
The C&E variation, if any (for example, monotype)

Remember that-

Some starters are banned, namely Pokemon that do not evolve or have already evolved, and Burmy, Caterpie, Combee, Cosmog, Honedge, Kricketot, Magikarp, Scatterbug, Sunkern, Torchic, Tynamo, Type: Null, Weedle, and Wurmple
You can use a C&E generator to generate pokemon- https://xfix.github.io/ce/
C&Es have to be single elimination, and the number of participants must be a power of 2 (2 and 4 player aren't allowed, 8 and 16 are preferred [8 for newer hosts/if there are lower than ~250 users in the room], 32 if there's a lot of activity in the room (say 550+ users) and you're confident that you can host it successfully)
In the tournament settings, go to Registration, and under it, tick 'Host a sign-up page', and then tick 'Make your sign up page publicly visible' - this will eliminate the need to link the signups in chat, that is, instead of having to link challonge.com/signups/tournamentURLhere in chat, you can link challonge.com/tournamentURLhere and people will be able to join.
You can't join your own C&E, since the host could give himself a great Pokemon, and there's no way to prove that (s)he rigged it.