Good morning everyone!
Sorry for the delay in answering questions.
First off, you do need a license to operate these radios. It is a simple process to get a license and with all the online tools, it is very easy to study for.
I will say that amateur radio is a fun hobby. There are a lot of aspects to it that fill many niches from public service, such as Skywarn and emergency communications during disasters, to contesting and just the electronic side of it with building gear and antennas.
I personally got my license because I do go into the woods and wanted a more reliable form of communication, but again that took into account that i have friends who also have license and we communicate in our group on most occasions.
The gear I have is middle of the road with some radios being less expensive and some being much more expensive. The hand held (VX-7R) I think is currently in the $300.00 range. The FT-817(pack radio) is probably more in the $600.00 range. Just keep in mind that this is gear that suited my needs. There are lots of options.
As to the weight of the pack radio, the radio itself weighs about 2 pounds. The majority of the weight is the external battery. I use SLA 7 or 5 amp hour batteries and they weigh from 3 to 5 pounds. the 5 amp hour battery will last me 2 days or more of mostly listening with limited transmission. Even with the radio,battery and several antennas I still have room in the pack to spare.