How do i update this id with the new information?

I'm pretty new to this, so asking seems appropriate. Basically, i'm trying to Query for some data. So did that, I queried the ID of the License i need, then im finding every user who matches the profile ID and telling my program they need this license. Basically i'm stuck trying to figure out what i need to change to make this work.

I don't think i need the first For loop where i query for the license ID, but i dont know how to make it work without a For loop. the reason i need it to work without a For loop is so the other two for loops can see the variables. The error im getting now is in the third For loop.

upl.UserId = listUsersToAssignLicenses[i].Id <-- Error no definition for Id

How come it isnt recognizing Id? is it because i need to reference the index of the list? If so, how do i do that?

Do i need the first for loop?

How do i write a bulk insert and allow an error message to tell me how many licenses are left?

Sorry for so many questions, i dont know if im even allowed to ask more than one. Just kind of frustrated. Thanks!

        QueryResult getUsers = null;
        QueryResult queryPackageLicenses = null;
        String SOQL = "";
        String getUsersSOQL = "";
        SOQL = "Select Id, NamespacePrefix, AllowedLicenses, UsedLicenses, ExpirationDate, Status from PackageLicense Where NamespacePrefix = SVMXC";
        queryPackageLicenses = Sfdcbinding.query(SOQL);
        getUsersSOQL = "Select Id, FirstName, LastName From User Where ProfileId = 00e400000013Yv9AAE"; //Dispatch ID
        getUsers = Sfdcbinding.query(getUsersSOQL);

        string SVMXCID = null;
        string namespacePrefix = null;
        int? allowedLicenses = null;
        int? usedLicenses = null;
        string expirationDate = null;
        string status = null;
        string userId = null;
        string firstName = null;
        string lastName = null;
        string profileID = "00e400000013Yv9AAE";
        int? licensesLeft = null;

        if (getUsers.size > 0)
        {
            for (int i = 0; i < queryPackageLicenses.size; i++)
            {
                PackageLicense pl = (PackageLicense)queryPackageLicenses.records[i];
                SVMXCID = pl.Id;
                namespacePrefix = pl.NamespacePrefix;
                allowedLicenses = pl.AllowedLicenses;
                usedLicenses = pl.UsedLicenses;
                expirationDate = pl.ExpirationDate.ToString();
                status = pl.Status;
                string[] packLicense = { SVMXCID, namespacePrefix, expirationDate, status };
                int?[] packLicense1 = { allowedLicenses, usedLicenses};
                lstSVMXCTest.Items.Add("SVMXCID     Name       Allowed Licenses      Used Licenses       Expiration       Status");
                lstSVMXCTest.Items.Add(string.Format("{0}      {1}     {2}     {3}     {4}     {5}", SVMXCID, namespacePrefix, allowedLicenses, usedLicenses, expirationDate, status));
                licensesLeft = (allowedLicenses - usedLicenses);                    
            }

            for (int i = 0; i < getUsers.size; i++) ///Returns users who match the Profile ID above. (Dispatch) Can you add more than 1 profile to list?
            {
                User uid = (User)getUsers.records[i];
                userId = uid.Id;
                firstName = uid.FirstName;
                lastName = uid.LastName;
                string[] UID = { userId, firstName, lastName };
                listGetUsersWithProfile.AddRange(UID);
                lstSVMXCTest.Items.Add(string.Format("{0}    {1} {2}", userId, firstName, lastName));
            }
                List<string> listUsersToAssignLicenses = listGetUsersWithProfile;
                List<UserPackageLicense> firstUpl = new List<UserPackageLicense>();
                //create a new UserPackageLicense record for each user with a specified profile

            for (int i = 0; i < listUsersToAssignLicenses.Count; i++)
            {
                UserPackageLicense upl = new UserPackageLicense();
                upl.PackageLicenseId = "05040000000TQfcAAG"; //SVMXC ID
                upl.UserId = listUsersToAssignLicenses[i].Id;
                firstUpl.add(upl);
            }

            try
            {
                //Bulk Insert
               //insert (FirstUPL);
            }