The PIKO G Scale DCC kit is quite straightforward to set up and use. The basic set up uses a 5 Amp supply, with additional boosters available if needed
It is made by Massoth, so is backward compatible with LGB MTS, and if you become interested in doing more with DCC you can readily add Massoth components.
See here for PIKO G Scale DCC brochure.... https://wgrr.ca/assets/images/99330_G_Digital_Flyer.pdf
If you want simple DCC, the PIKO system is a good choice.
Can be bought here: Piko G Scale Complete Digital System (35010, 35020, 35037, 35038) by Massoth