If you had said that he had behaved any other way - that would have been a red flag! Llamas are aloof by nature. They will approach out of curiosity, but require "desensitization" to be touched and handled. If males are handled too much when they are young, it can result in something called "berzerk llama syndrome" (not kidding) where the llama tries to mount people and can cause severe injury. It is good that he knows he is a llama.
One thing to caution you about though - he is an intact male, and if he does not have a female, he may mount and injure your other animals - as laying down to a llama is an invitation to be bred. I would advise you to have him castrated. While they are doing that, you will also want to have his "fighting teeth" cut. Male llamas grow a set of teeth that are like shark teeth - and they can actually castrate another male with them! They need to be kept short if you want to prevent injury...even geldings can continue to grow them (but more slowly) so it is good to keep an eye on them...
General care involves toenail trimming, CD/T vaccination if you vaccinate, regular worming (meningeal worm, carried by deer, is fatal to them), shearing, and be aware that they are susceptible to ticks, which can cause paralysis (which usually can be reversed if the tick is removed)...
There are lots of llamas "free to a good home" right now, as they live 18-25 years...female llamas do not have estrus cycles like other livestock - and can be bred any day of the year and conceive - unless they are already pregnant. If you have a male and female, you have babies. Please don't, unless you have a home for the baby, or you area is not already saturated with llamas needing homes. This is a soapbox for us, as we have fostered and rescued many llamas, as have many of our farming friends, ...and still can't take enough. They are pregnant for 11 months, and need to care for their babies for about that long, without overhandling by people...
They are wonderful livestock guardians, and trail buddies, but don't enjoy contact the way other animals do. We have children with autism, and if ever there were an animal that embodied autistic traits - it would be a llama - which is great for our kids - because the llamas respect their space.
Llamas are very head and leg sensitive...preferring to be touched on the neck only. They cannot be mistreated, because they do not forget. You have to earn their trust and respect. They are extremely intelligent, and keenly observant. If you like cats, you might like llama temperaments...
All that said - we love our llamas - and would love it if everyone loved llamas - but they are unique, and not everyone enjoys them!
We are so glad you asked questions, and did research before you took the leap - and hope you got all of the answers you needed! We wish you both well!