Tips for creating a DarkRP server?

Sorry to break it to you, but you are not "halfway there". You still have to get all your addons, customize them to your liking, then optimise them to fit your server style.

Use some of my Addons...
They dont have any backdoors, I promise...
hehe :3

If you want to make a DarkRP server, I would try to learn as much as possible about lua.. or get someone to Develop your server for you.

I would start off with getting a workshop collection, after that I would put it in the server.
Then I would fix the server name through -> server.cfg then I would create some basic jobs like.. thief, swat and staff on duty.

And I watch watch hell of a lot of YouTube tutorials to learn everything that's needed to be a basic darkrp owner, also invite ur friends for fun and players

Use the Cars TDM cars and a pack of weapons well handsome

When you are making a Garrys Mod Darkrp Server plz don't add gay rules that don;t allow people to mug or raid every 10 minutes, and also add money printer and bitminers

Make it unique, dont just make it a cops vs robbers game, reward good roleplaying and punish careless or hyper aggressive gameplay.

Just remember, when it comes to addons, quality over quantity.

Don't buy any scripts off of gmodstore or any script sharing website and make your own

You can add UTime to jobs so players need to play sometime before employ on a job.

Make it different to other server or no-one will join