Hi,
yes of course I can provide the changes + extra stuff, with the humans I made I messed up they are meant to be variant human but the others are correct.
it is a fantasy setting and the overall goal will be about finally putting an end to the humans expansion (how this is done is upto the players) smaller goals will be learning about other races and their ways, hopefully get them on your side for the final battle.
you’ll start level 1 with a lot of rp early (milestones for leveling) as for level it will end it depends on how long it ends up running, so not fully sure on that. I did start a campaign with some others in the world and the first few sessions have gone well but very little combat so far.
as for dming I have been one for just over a year and ran oneshots or full campaigns.
As for the options, gunslinger would be likely human as they are the only ones that really kept machines but if they can come up with a good reason another race might be one, most animal based races, underdark races and quite a few subraces (see the world anvil for those as they have been combined into one races)
adding on that dragonborn are like that due to the usual dragons long being dead, instead ones more “tree like” have taken their place.