So the basic list of things you are going to need:

Gas Side:

• Regulator - to change the high pressure of the tank to usable regulated pressure - pretty much any of them will do, here is an example, just worth making sure it has the right connection to attach to your CO2 supply.
• Gas in connection (these are normally grey or white) - most homebrew application uses "quick disconnects" (QD) and they are either ball lock or pin lock. I use ball lock but this is because I have ball lock kegs. Here is a ball lock one.
• Some gas pipe to connect things together, both the regulator and the QD have 5/16 inch barbs so you need a similar pipe, 5/16 inner diameter, so here is one such pipe.

Using some jubilee clips or hose clamps you can attach the pipe to the regulator and then the regulator to your QD. You can then attach the QD to your keg.

So in the example product you have linked earlier this would go on the angled post and provide CO2 at the pressure your regulator is set to

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Storage:

The mini keg you linked to looked nice and would work well with the top to add the relevant QDs.

I personally use full size corny kegs like this one, they hold 5 gallons, but I have a dedicated freezer with a temperature controller that I keep my kegs in. They come in either ball lock or pin lock, the linked one is ball lock to match the QDs mentioned.

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Liquid Side:

• Liquid out connection (this are normally black) and very similar to the gas one we linked earlier, they do normally have a slightly wider barb on them 1/4 inch. Here is an example.
• tap - if you are serving from a keg in a fridge then a picnic tap or cobra tap might be the easiest option (or an all in one option shown below) but you can buy picnic taps too.
• Pipe to connect them - Here is an example

or

• All in one tap -> https://www.amazon.com/dp/B075CF8GW6/?coliid=I12OI31M6M3WQM, this is a tap attached to a QD so it might take some of the work away, depending how the keg sits in your fridge it obviously could be slightly awkward to use.
• All in one cobra tap -> https://www.amazon.com/PERA-ball-assembly-picnic-brewing/dp/B079M69K42 , this is a tap attached to a line so it can be more convenient to use as the pipe can be moved around easily.

You could always go whole hog and build yourself a keezer / keggerator or a bar and then use taps with full shanks like this one, but its really all the same just a valve at the end of a pipe.

Again you would want to use jubilee clips or hose clamps to hold the pipe to the QD and the tap of your choice but that is really all there is to it, open the tap and liquid comes out (assuming their is pressure to push it) close the tap and it stops.

So in the example product you have linked earlier this would go on the vertical post and allow liquid to leave the keg.

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I would just note that I have not checked the reviews of any of those products or who their supplier is, I did avoid anything that looked really bad but I am in the UK so I just went along with most of what I saw.

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I put a deposit on my CO2 tank from a local supplier and take it back there to swap it for a full one every time it runs out, just paying for the CO2 when I do that.