If you want to "try out the sport" as you say you really ought to look at a used complete....
Buying a frame on its own and building it up is a lot of work, research, know how, and there's a decent number of things that can be frustrating/hard if you don't know what's going on. This can be double-ed down on a chinese frame. There's a higher chance of bullshit happening. The bearings aren't going to be as high quality, so you'll need to change them sooner (and sometimes right away). Unlike a Norco, Trek, Giant, etc., you can't look up a handy chart that has all the bearing part numbers. Cool. You get to measure! Hope you're good at that. Trying to put together your initial parts list? Well it's a whole lot more complicated when you can't look your specs up or whatever you're looking at is missing information. Sure, you can see what seat post you need, but they almost never list which rear rotor is sized w/ no adapter or what the seat clamp is. Get the calipers out again!
Worst case, there's a crack in your frame! Well, some companies are really good, but others might have you wait months... and others might never get back to you at all with no recourse other than to complain on this forum.
Don't get me wrong - I don't hate chinese DIY bikes, and I don't hate building up frames. I think it's a cool aspect of the hobby. BUT for many of us it's just that - part of the hobby. Few of us start with NO other bike to ride if something goes wrong on our first build.
For someone who just wants to cut their teeth? Pick up something used and relatively cheap. If you love the sport, great - you have a couple options - keep/upgrade your used ride, or because it already hit most of its depreciation, sell it for close to what you got it for THEN look at something like this or a frame up build from elsewhere.
