Suggestions for integrating new geese into an existing flock?

I have an existing flock of 8, 2 year old geese who are very friendly and really like people and I recently brought home three 1 year old geese. Long story short the 3 geese are pretty terrified of everything and don't really act like normal geese in my opinion. I am trying to get all of them to get along in one group. Is this even possible? What would be the best way to go about doing so if it is? How concerned should I be about my existing flock picking up "bad habits" (being scared of everything) from the new geese?

It may take a while for the three new ones to integrate with the existing ones, especially bringing them in during the middle of breeding season which is not going to cause the existing geese to be welcoming. At least the three new ones have each other to be their own little gaggle.

When bringing in new birds I like to quarantine them for 30 days before beginning to introduce them. It gives them time to get acclimated to hearing each other. Fighting is to be expected in the beginning also. Unless they are seriously damaging each other I don't interfere. Some feathers will get pulled out but they need to figure things out between themselves so they can get along later. After breeding season things should start calming down and by winter everything should be worked out.

As far as the existing geese picking up bad habits from the new geese like fear reaction, I wouldn't worry. The existing geese already have the reaction hardwired in their brains, they are just not acting that way cause there is no reason to. The new geese will figure out there is not reason to act that way also and should calm down soon.

Thanks! I was pretty much planning on going about it like that and figured everything should be okay, but I just needed some reassurance I wasn't too thrilled about the timing of bringing the new ones home, but giving the situation they were in I didn't have much choice in when I got them if I wanted to get them at all. Is there a specific part of the year that is considered breeding season or does it vary depending on where you live based on your weather? Given that these are my first geese I have a lot to learn still I gathered that breeding season is like the end of winter (like March or so) until the end of spring (like the end of May or so)? Is that right?

Breeding season depends on the weather where you live. Mating behavior in my gaggle usually starts taking place the second week of January with eggs starting anywhere from last week of January to the second week of February. It usually ends in May when it starts getting hot here. Geese are going to do what they are going to do when they are going to do it regardless of what we want. Also when you think you have them figured out, they will change the rules and have been known to go broody in November, while it is snowing outside or fall in love with a horse or a dog or a person.

Out of curiosity what kind of geese do you have?

I have Pomeranians at the moment. Although I would like to maybe try an Embden, pilgrim or American buff in the future. I have figured that the geese are pretty much their own "people" and do what the want when they want. The 2 yr old ones have just quit laying eggs after having laid for basically a year or so straight. They started laying in December when they were like nine months old and have been laying since then. They went broody this spring, but nothing hatched so I got rid of the eggs when they started to go bad and that has been it. I am interested to see what they decide to do next, especially because I have no idea what made them lay eggs like that to begin with.