As a complete beginner I wouldn't spend money on that set up just yet. You can get the clamps on amazon here that will save you a ton of money and space. Just screw them into an old table or countertop you don't mind getting paint on.
Im pretty sure those are both the same Ryonet sets. (or the same product branded differently) I have one and it works great for at home t shirts, for posters and paper printing you can use all the same stuff, however a big table that you can screw screen printing hinges into will work much better for paper prints.
https://www.amazon.com/Speedball-Hinge-Clamp-Screen-Printing/dp/B001E0FI3E
Hinge clamps like these work very well to keep your screen in the same place, and are still pretty minimalist.
If you want to go a little more complex, do an internet search for, "DIY t-shirt screen printing press," or something similar, and you will find a bunch of pretty easy-to-make setups that use hinge clamps, but are a little better than the "flat on a table" setup.
There is a way to register. You need your screen fixed with cheap hinged frame clamps:
https://www.amazon.co.uk/Speedball-Screen-Printing-Hinge-Clamp/dp/B001E0FI3E
Then print onto a transparency taped at the side. Slide your metal under the transparency until it is in the desired position, then fold away your transparency and print.
edit: seeing your other work, I guess you know this and I am missing a complexity
I just picked up a pair as well. Amazon has them at a good price, well at least $15 less than my local art supply store. speedball hinge clamps
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Amazon Product | Speedball Hinge Clamp Pair for Screen Printing
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Amazon Link Assuming you are in the USA and/or Prime Member- otherwise you could probably find something to do the same job at a hardware store or sites that better serve your area. Hell, you could probably get a local welder to tack a couple of them together for you from of the shelf parts, its just a clampable hinge...
On a side note: you should be building screens! Its pretty easy to do on the cheap and lets you start working with multicolor prints!
I have the more expensive model of pretty much the same thing.(still looking for clients.) Depending on what you are printing.. If you really want to start small, just get a 110 screen, and some hinge clamps.. Do some one colors.. https://www.amazon.com/Speedball-Hinge-Clamp-Screen-Printing/dp/B001E0FI3E/ref=sr_1_1?ie=UTF8&qid=1478171684&sr=8-1&keywords=hinge+clamps