Email Resortalia (roda@resortalia.com) regarding Community and Entidad fees - but also your solicitor should have all this info for you.
Don't forget to get the cost of your IBI charges from your solicitor.
There are several threads on this Roda Community forum about TV and Broadband - you'll find costs and the various options on one of them - as there are multiple ways you can deliver this to your apartment.
For TV and broadband contact Internet Mar Menor - shop near Mercadona.
But there is another internet shop just opened up next to the Hotel 525 - no idea of their offering though.
As to the utilities - how long is a piece of string? It depends how much you use it. What one person considers average another will likely consider either cheap or expensive.
Our summer electric bills are about €150 pm - but then we do rent out and the air-con gets used. A LOT !
Insurance cost is comparable to UK. Make sure you insure contents AND buildings. Although all communities have to carry buildings insurance by law the coverage is VERY limited and will really only cover you if the building falls down.