The best advice I can offer is the same as offer to anyone who has to learn a brand when he's already familiar with another. Don't try to make the new brand behave like the old brand. Every PLC brand has to do the same basic things, but each brand has its own approach to those tasks.
The GE 90-30 line is contemporary to and similar in capability to the SLC series. The 90-70 is a contemporary of the PLC5. The Rx3i is similar to the CompactLogix. The VersaMax is similar to the MicroLogix.
The current name for the programming software is called Proficy Machine Edition. The same software, with the proper licenses can program the full product lineup including the Quick Panel HMIs.
Emerson purchased GE's PLC and HMI product lines a couple of years ago. Most of the local distributors who carried the products when they were GE continue to carry them now that they are Emerson. Your local distributor can steer you toward training. Some distributors offer training themselves, others send people to factory training.