Macro Kit

I'm just starting to get really interested in Macro Photography after over 40 years of using a camera.

I have a Pentax 100mm macro lens but was wondering what I should be considering as a nest purchase.

I would like to get in closer than I can with the 100mm, so the thought of extension tubes or bellows
came up!

Any suggestions, I'm currently using K5 and K7 bodies.

Thanks

Got decent lighting?, IMO nearly as important as the lens itself.

To get closer use tubes or something like a Raynox DCR-250

Or if you want to get really messy start reversing lenses.

Lighting, look on flea bay for a cheap ringlight Something like this would be a nice place to start.

Lighting not a problem, I plan on doing lots of studio work at first, so I will utilise my Bowens kit
(2xGemini 500 heads and so much paraphenalia it's an embarrassment)
Are there any auto extension tubes on the market for Pentax?

Auto to a point, you still have to manual focus, I have a set that came from Poland, cheap but work fine.Not sure who makes these tubes but they do seam readily available for Pentax

https://www.pentaxuser.com/forum/topic/fs--jessops-pka-af-auto-extension-tube-se...
I use a set of the above which work quite well when modified as shown.