Using Get-Content in Script

I am attempting to leverage Powershell to update custom properties of a batch of nodes with no consistent IP schemes. I am fairly new to Powershell, but I have a script working to change custom properties of a single IP. I was hoping I could create a text file and somewhere in the script reference the text file of IPs.

Here's the script:

#Intialization 

Add-PSSNapin SwisSnapin 

# Connect to SWIS 

$hostname = "x.x.x.x"

$username = "username"

$password = get-content Path\To\PWinfo.txt | convertto-securestring 

$cred = New-Object -typename System.Management.Automation.PSCredential -argumentlist $username, $password 

$swis = Connect-Swis -host $hostname -cred $cred

# prepare a custom property value 

$customProps = @{ 

  Address=" "

  ASRN=" "

  AssetTag=" "

  CircuitID=" "

  City=" "

  Comments=" "

  ConfiguredBy=" "

  Department=" "

  ESN=" "

  FourthSiteEmail=" "

  InServiceDate=" "

  PONumber=" "

  PurchaseDate=" "

  PurchasePrice=" "

  Recorder_Type=" "

  SecondarySiteEmail=" "

  SiteEmail=" "

  TertiarySiteEmail=" "

  Tower_Location=" "

} 

# set the custom property 

$uris = Get-SwisData $swis "SELECT Nodes.CustomProperties.Uri FROM Orion.Nodes WHERE IP_Address LIKE 'x.x.x.x'" 

$uris | Set-SwisObject $swis -Properties $customProps

Where would I inject the get-content file to be referenced? Thanks in advance!