Don't send any money to Bithull, they will
scam you.
I wouldn't suggest you to buy ASIC right now with your amount of knowledge, as they are not really PLUG-n-PLAY, you must know how to choose pools, make pool account, choose wallet, make wallet, connect ASIC to pool, and connect pool to wallet (that is simply said). For now, I'd recommend you to do some GPU mining with nicehash (easy to use and introduce you to mining)
I would argue that setting up an ASIC miner is a lot simpler than mining with a GPU even at Nicehash, I own both ASICs and GPUs and when I started mining with GPUs I was far from a beginner in terms of dealing with hardware, and I can tell you it was not really too easy, with MOST GPUs overclocking is a must, and then you get to the part where you have to configure Claymore and all that, I am not claiming it's rocket science, it's doable pretty much by anyone who understands how to install a driver but IMO mining with an ASIC is simpler and easier by a few steps.
Another thing I would like to mention is that in most cases mining with a GPU doesn't really teach a thing about mining with an ASIC, aside from picking the right pool and all that, the experience is TOTALLY different, the difference between a GPU miner and someone who never mined with a GPU is little to nothing when it comes to having an ASIC, so in general, I am against this theory of start with a GPU then move to ASIC, I used to think it works but now I don't anymore.
My advice is that if you want to end up owning an ASIC miner, start with an ASIC miner, there are no short-cuts, the only thing you could do to reduce the risk is by starting with small and cheap gear, even if you mine at loss for a while, once you know how to treat an ASIC, then try to grow.
All of the above worth much less if your power rate is not competitive enough, in my humble opinion, anyone who has a power rate above 6-7 cents per Kwh should discard mining altogether, that's not a solid rule, maybe not even agreed upon by so many people, but that way I see it is that mining, in a nutshell, is a "power rate competition", when the average rate for huge farms is 2-5 cents, how does one expect to beat them long term with 8 or 15 cents? I just don't see that happens unless you want to count on your luck, which in that case you should probably just buy crypto and hodl it.