- I was told that I need a separate line of 220V, however I was thinking to get a step-up trafo from 110 to 220V having 5000W. Is this OK?
You could, but I would advice against it, there would some energy loss in this process, better to install 220v.
- I understood that the antminer comes w/o any power cables, so I have to get 2 power cables (similar like those for PCs) from what I could see on its picture, correct?
It's called C13, ya it's the same plug as the one you use on your PC, but sure thing is, it isn't the same rating, you are going to need each wire to be at least 1.5mm square thick.
- what software do I need in order to have it mine properly?
Nothing, just your Chrome browser or whatever you already use.
- in order to configure it, is it possible to connect it to a monitor and a keyboard?
No, you use your laptop / PC, write the miner IP address on the browser, and you will be inside the miner to do the pool configuration.
- I saw on a tutorial video that the miner needs 2 cables, so would I also need a UPS to plug those cables?
You mean PDU? you can, or you can just get the Y split cable that phill posted above, the only issue with that Y spilt is that your breaker/socket need to handle the entire amp draw whereby using 2 single cables the load is divided.
- as sometimes most of tutorial videos are pretty old regarding pools, and software used, is it possible to get a link towards a more recent video?
Nothing has changed ever since, all you need is pool URL and a worker name.
- do I need a cold wallet? I have right now 2 wallets on Crypto and Shakepay, however I understood that more securely would be a cold wallet, so which one would be a good one to use?
Your mining payouts will be sent to whatever address to enter in the pool website, they don't know/care what address is that, which wallet to use is off-topic and should be taken to Wallets sections