To setup your own local orderbook, the only thing you need is an install of Joinmarket (you don't need Bitcoin Core for that);
follow either the Quick Install on the readme (./install.sh) (RECOMMENDED), or one of the manual installation as per here.
To run the orderbook without access to Bitcoin Core, edit the joinmarket.cfg file in your Joinmarket data directory as per below
(NOTE: if you don't have a data directory, it will be created the first time you run the script).
[BLOCKCHAIN]
blockchain_source = no-blockchain
Comments are omitted; do read them.
You may also want to check the [MESSAGING:server] options, e.g., if you want to use IRC Tor onion services you can edit the relevant parts.
Launch the ob-watcher.py script from scripts/obwatch as any other Joinmarket script.
(jmvenv)$ python ob-watcher.py
Add -p PORT to use a custom port (default is equivalent to -p 62601).
Then open the link to the just created local server in your favorite browser.