Welcome to the forum, Lonnie!
Your grandson did a good job getting you back into the hobby!

You can certainly move up to the CW-80 transformer to run 2 trains. It should handle the trains as well as a few lighted accessories.
Eventually, as your layout expands, you may look into either a bigger transformer than the CW-80, or another stand-alone transformer specifically to power your accessories only.
Many hobbyists look to the used transformer market to upgrade power. There are many transformers available at hobby shops and train shows to be had at very reasonable prices that can handle multiple trains, with power to spare for accessories, such as the old KW and ZW transformers. For the price of a new CW-80, you can get a refurbished ZW with 3 times the power of the CW-80.

Larry