The Services division at Latitude Geographics does ArcGIS Server hosting, but I have no idea what the cost is nor have I used it. I have used their Geocortex Essentials line and worked with them on custom ArcGIS Server web app development, and they are a great company with very talented developers, product managers, project managers - you name it. Give them ...
If I understand correctly you have a paper plan of city and you want to create a table with geometries and ref numbers from readed 'manualy' coordinates from this paper map?
Your table name is parcels
It have column ref_number and geom
The query could be:
insert into parcels(ref_number,geom) values (1,ST_makepoint(wsp_x, wsp_y))
You can ...
The local system browser knows about your domain just because you've added an /etc/hosts entry pointing domain to your localhost.
I see two ways for you to see your cartodb from a remote network:
a) accessing your computer using it's public IP, like this: http://public_ip:3000
b) having access to your DNS server and inserting Address records for your ...