First post - welcome to JF
You can get records for whatever has been done at a dealer by getting your vin number and having them run a VIP report on it. It will tell you at least whatever has been done in it's life at a Jeep dealership. You for sure do want to get the timing belt and the related items replaced. Can't recommend anywhere as I'm up on the northern plains. Here is a cut and paste of most of the part numbers for the timing belt change from moparonline parts.
5142579AA - Timing belt - $133.09
5142798AA - Tensioner - $72.54
5142573AA - Idler pulley (2) - $99.10
5066921AA - Timing cover Gasket - $11.88
5159019AA - Water pump O-ring #2 - $3.96
4864575 - Water pump Gasket - $2.25
5142601AA - Thermostat - $93.49
5066806AA - Thermostat gasket - $1.76
5142985AA - Water pump - $153.99
Sub Total $572.06
One of the other things you will want to do soon - is get the EGR taken care of. Kinda spendy if one of those fails on you - which is quite common. Quickest and for now the best way to do that would be through a Green Diesel Engineering (GDE) tune. It will take care of that and add quite a few other enhancements as well.
Green Diesel Engineering - Jeep Performance ECU Chip Tuner
Hope that is of some help.