Start the app and select the folder you have created for your 360 under Document Root.
Select Start under Service.
Now your folder content is served locally (and remotely on your network if you are online) and you can access it in your Android web browser via localhost:
There're other server apps with no ads out there, but this one seems most reliable with over 100k installations, and it will run as a service, i.e it would auto-start on device reboot.