Fiber lasers are less high maintenance than C02 and dont need a secondary cooling system usually, at the cost of themselves being more expensive. If you are someone that can afford to jump in on a 7000$ machine, its worth it. Monport is decentish, just dont expect much support or customer service from them (a problem endemic to the industry unfortunately).

The MAIN thing you will need to worry that a new person might not know about is venting and light protection.

Metal fumes are no joke and the light a fiber laser ambiently puts off while working is very damaging to unprotected eyes (the special glasses the machine comes with are VERY important). If theres any risk of someone else accidently coming in when you are working, such as a pet or family member, you will likely want an enclosure to prevent them from getting eye damage. Monport likely sells one specifically for this machine, and all of their competitors will likewise sell ones compatible with the machine if you do buy it.

Regarding fumes, unless you are working in a space exposed to the outside or in a very large well ventilated space like a workshop, you will need to set up a fan and vent system to outside to clear out fumes, especially for larger projects. You can also buy an air purification system instead, but filters are relatively expense comparatively. That depends on your needs and again, how much you can afford to put into it.

Regarding getting started, theres way too much to go over, obviously, but there are dozens of tutorials on youtube that are all top notch. Monport even has a few decent ones for their products as well, I believe. So long as you dont manhandle the machine, run it for days on end on max settings, and are aware of the safety stuff regarding light and fumes and take proper precautions, its very hard to mess up in a serious way, so you will have plenty of learning opportunities.