Don't sweat it. It is easier than you think.
1. In all likelihood you will be released from Brisbane Centre after you depart MSO and instructed to call Tamworth Tower for clearance (you will be in touch with tower before entering the TW airspace). Make a joining call to TW TWR.
2. Make a standard joining call and include your inbound radial.
3. For an ILS track direct to the field is possible, but coming in from MSO it is more likely you are cleared to BRADD (commence the ILS from there).
4. Inside 25 miles Twr will clear you to 5600 feet.
5. TW Twr will want you to tell them what you want. Not sure about your question here. If you want a hold, tell them. If you don't want to hold, tell them. If they have traffic issues they will tell you what to do.
6. Well prior to the MAP you will have told tower what your intentions are. They will issue a clearance based on that.
Have a great trip!
