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The kindles were not designed as secure devices, or even as multi-user devices. What you want would require some significant hacks to achieve. The simplest way would be to rename the files or links to them to break the apps that you want to prevent from running, but that could have side effects. One problem is that it may cause an OTA (automatic Over The Air) update to fail, possibly even bricking your kindle. Another is that an update may restore missing files, re-enabling stuff that you disabled.
Using a wifi password could prevent connecting to YOUR wifi network when you go into settings and tell the kindle to "forget" the connection. But if a neighbor has an open access point, the kindle could be connected their.
Children these days are often a lot more technically competent than we give them credit for, having grown up with technology as part of their environment and part of their language.
The kindle security locks down the entire device completely if you give it a password, and supplying the password to "log in" enables all the functionality.
If your kindle is registered, others who have access to it can buy stuff from the kindle store. You need to control WHO has access to it, OR lock it with a password.
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