Long time hammock user here. That rainfly in the video is good only for good weather. A tarp with end doors is needed to block rain in blowing wind. Lots of options out there, but for the price and quality the Warbonnet Superfly is the tarp to get. Linked here:

Superfly Tarp

Also, the hammock linked, the Roo, looks like a good starter hammock, but it won't be a comfortable as a hammock with ridgeline. The ridgeline allows one to obtain a consistent sag so the comfort is the same each time whereas the Roo, without a ridgeline, maybe pulled tighter or looser each hang and change the comfort level each hang.

Two other things. Staying warm is key in a hammock. Most experienced hammock users turn to underquilts to keep the backside warm. Wide closed cell foam pads also work, but work better in a doubled layered hammock like the Blackbird linked above (or the less expensive Traveler). The double layered hammock also provides protection against mosquito bites underneath. A bug net is needed to cover the opening against bugs. An integrated bug net is nice, but I favor nets that can be removed and added as needed.

Consider making your own hammock and bug nets. Very easy. Lots of instructions on Hammockforums.net.