It’s important to know how to modify your own charts, as they need to be customized to what you have and what you want. You also want to know how to make these changes, in case you’re in the middle of a trade and the chart doesn’t have something you need. It’s worth learning this, so you’ll have the knowledge to create your own charts and therefore increased confidence in your use of the platform.
thinkorswim does provide some great training on how to set up charts in their learning center. They have videos and text instructions with steps to walk you through what you need to set up your charts. Setting up charts (less than 10 minutes): https://tlc.thinkorswim.com/center/howToTos/thinkManual/charts . If you find this helpful, it would be worthwhile to walk through more of the “howto” sections, starting with the layouts: https://tlc.thinkorswim.com/center/howToTos/thinkManual/Getting-Started . The complete set of “how-to” tools are available here: https://tlc.thinkorswim.com/center/howToTos
For TradeStation, you can find their learning tools at this link: https://www.tradestation.com/learn
NinjaTrader 8 provides help at https://ninjatrader.com/support/helpGuides/nt8, and video guides at https://ninjatrader.com/support/helpGuides/nt8/video_library.htm. The New User Video guides are a great place to start when you're brand new. You'll find some links to NT7 help on these pages as well.
eSignal help: https://www.esignal.com/video-tutorials
You can use Google to search for similar help for other platforms or topics.