I'm slowly emerging from an abstinence-only sex-ed that I held onto all the way into adulthood, so almost anything you tell me here will be new information. Because of this I also really don't know how to speak naturally or appropriately about any of these things, so please, bear with me, even if the rest of this post sounds crazy.
I want to have a better time by myself and I want to explore ways of getting into a better headspace while writing, so I'm looking around for something that goes in the back and stimulates the prostate and maybe the perineum, is easy to clean, can be used sitting down, and doesn't have electric parts that require special maintenance and cleaning, unless vibration is really just that important.
I don't know about brands or pricing or materials or how to effectively research them. Any advice you can spare would be much appreciated.
Personally I would recommend looking into a buttplug training set. It meets your criteria for what your looking for and is solely designed to help those who are new to exploring that specific part of their body.
They typically come in sets of three increasing sizes to help ease yourself into the sensations and because of the use-case are always a safe material. Brands really don't matter all that much, but they commonly come in metal or glass. Both are fine, but metal can be a bit...cold sometimes. If you intend to leave them in for long periods of time, avoid a flat base style as it will irritate your exterior skin over time. The sets are usually very reasonably priced, maybe a max of $(US)30 depending on where you shop.
Once you know a bit more about what you want you can move to a more specific tool/toy depending on what you like best about the play, but this should help give you a baseline so that you don't do too much too fast.