Lack of rules for new miniature.

Thx for the reply!

Oh, ok. So my friend who wants to play Lizardmen just made a mistake and thougt there was no rule for Bastiladon.
But anyway, do you use new miniatures which has no rule in 8th edition AB?
And if yes, how?

KevinC, who set up this forum, is known for writing balanced new rules for models. If there's anything in particular you want rules for, the odds are he's done it already, but if not, you could ask him politely if he'd be happy to have a go.

So long as your opponent is fine with homebrew rules I suggest taking an existing 8th edition unit which is similar in some ways to the unit which you want to add and adjusting from there
Balance wise, for acceptance reasons it's better for any added units to be underpowered rather than overpowered.

This, in addition to your opponent being able to understand the thought process behind the unit and seeing easily how it compares to an existing Warhammer unit (the template) should greatly increase the chance of acceptance and your opponent being fine with the new unit/s being used.

I've created over 20 homebrew units and so long as they aren't just sprung on opponents they tend to be quite accepting. If I don't know the person before hand I'd normally have a normal game or 2 with them first before discussing homebrew units but most reasonable people are happy to try something new. Back in the day my local GW was great for this as before the Chaos Dwarf Legion of Azgorth was released the store manager then was happy for the homebrew fanmade list (created bt KevinC no less) to be used so homebrew was very accepted.

Since the advent of AOS I mostly home game but am fortunate enough to have created enough homebrew 'goodwill' that the people I play with have enough trust in my ability to create fun and well balanced units that they are happy to give them a go. This also gives them a chance to provide feedback as they play with/against the new unit/s.

It's the surprise and potential for imbalance/abuse which can give custom units a bad rap.

Now 8th Edition being 8 or so years old now homebrew units are an excellent way to keep things fresh and add new miniatures to the game from other manufacturers.

As mentioned KevinC is an amazing source for 8th edition units/armies and I'd recommend checking out the expansion/additional army section of this forum to see some of his incredibly produced pdf homebrew stuff. His work is actually an inspiration to me as one day I'd like to do similar PDFs for some of my favourite homebrew units that have been playtested in enough games that I'm happy with them and their rules.

Another good source is the Warhammer Armies blogspot where he has done homebrew 8th edition lists for Nippon etc. He doesn't have the same attention to balance or detail that KevinC has however (imo from reading his homebrew Dogs of War and Beastmen lists) but is still worth checking out as he's clearly passionate.

As with most things, communication is key.

Thanks everybody for helping and welcome me, im glad i found just a nice forum with nice people!
Gonna have a look at the links Horace, unfortunately there isn´t a thread for every army in the section "Army-book-development" but thank you anyway !!!

Have a great day everyone and read you soon