In terms of etiquette and things like that, there are a few things that I've found to be pretty common throughout play-by-post games:
Character actions are posted in unadorned plain text.
Quote:
The towering man draws the massive sword from his back, setting his stance against the upcoming rush of kobolds.
Your speech is done in bold text.
Quote:
Come and taste my steel! the barbarian growls, feeling his rage flow through his veins.
Internal thoughts are handled through italics. I've seen some folks use colored and italics for this to help differentiate.
Quote:
Dirty kobolds. Vile creatures. I would as soon bed a devil as I would to see a single of these vermin roam free. the sorcerer thinks to herself as she feels the wisps of poison start to coalesce in her hand.
Telepathy and the like ML has been using Crimson Bold Italics to differentiate
Quote:
Your mother was a softskin, dirty kobold vermin. she whispered directly into the little draconoid's tiny mind.
I do information about the spell I am casting or the actual game mechanic I am using in red font. I also try to include a link to the spell in the post, just a quirk of mine so I can get to the spell details quicker.
Anything out of character is posted using the OOC tags.
Quote:
OOC:
The barbarian really hates kobolds. I'm not sure if this would give him any kind of advantage on the strike? Are there any other rolls you want to see?
In general, I have a block of information I put at the bottom of my character's posts in combat that I keep in a google doc for quick access:
Casting silence.
1st 4/4 | 2nd 3/3 | 3rd 2/2
39/39 HP | 13 AC | Inspiration 0 | Wild Shape 2/2
Currently Prepared ([*] indicates a ritual spell):
1 - [Heal in Wild Shape form - 1d8], Goodberry, Ice Knife, Create or Destroy Water
2 - [Heal in Wild Shape form - 2d8], Heat Metal, Moonbeam, Locate Animals or Plants [*], Barkskin
3 - [Heal in Wild Shape form - 3d8], Water Breathing [*]
This lets me capture the mechanics I'm using that round, my spell slots available, my HP, AC, special features, etc, as well as my current prepped spell list (for casters only, obviously :) )
Looks like this in text form (remove the '/' character in the first tag to make it work):
[co/lor="red"]Casting [u/rl=http://engl393-dnd5th.wikia.com/wiki/Silence][/i]silence[/i][/url].[/color]
[co/lor="blue"]1st 4/4 | 2nd 3/3 | 3rd 2/2[/color]
[co/lor="teal"]39/39 HP | 13 AC | Inspiration 0 | Wild Shape 2/2[/color]
[co/lor="tomato"]Currently Prepared ([*] indicates a ritual spell):
1 - [Heal in Wild Shape form - 1d8], Goodberry, Ice Knife, Create or Destroy Water
2 - [Heal in Wild Shape form - 2d8], Heat Metal, Moonbeam, Locate Animals or Plants [*], Barkskin
3 - [Heal in Wild Shape form - 3d8], Water Breathing [*][/color]
I do not expect you all to do it to this level! I do ask that you keep track of your current HP, modified AC, and special abilities in some way that's easy for you and easy for me to also see. :)
In terms of things that make it go smoother, a lot of times in live games, people will wait to roll damage until after seeing if the hit lands. To speed up PBP games, it's common to include both the attack and damage in one set of rolls:
Rogue Rapier Stab with sneak attack: 1d20+5, 1d8+3, 1d6.
This will let the DM grab your damage right away if it hits, or they can ignore it if it's a miss.
Spoilers are very useful for things like speaking in other languages (so other players can read it if they have the language or can skip it if they don't have it). Also useful from a DM perspective for things like perception rolls:
[ +- ] Perception 15+
You see all the stuff on the ground. It burns!
With regards to the GamersPlane dice roller, there are some things to be aware of (examples included as rolls on this post):
The system doesn't currently allow for adding dice rolls together (such as 1d10+1d4). If you type in a roll like that in the dice roller, you will end up with 1d10+1 and a second roll of 1d4.
You
can put multiple rolls in a single line, very helpful for advantaged rolls:
Advantage Attack Roll: 1d20+5, 1d20+5, 1d8+3
Reroll Aces is from other game systems where you "explode" the die when it gets its maximum value. So if you were to roll a 1d6 with reroll aces, and you got a 6, it would reroll the 6 and add the new dice to the total
in addition to the 6. Example below.