Welcome! Toys are a hard thing, aren't they? I think there have been a number of threads in this forum about unwanted toys and how to handle that politely. One thing that I have done that I think helps us (as we have a great-grandmother who LOVES to shop) is to have catalogs sent to the home of the gift-buyers. That way, they're getting ideas that are more in line with what we would like our children to have. It's made a big difference for us and we're often consulted about gifts as a result.
Another idea is to rotate toys. My little girl knows that most anything she wants is in our basement (which is very old and unsafe for her) and that all she has to do is ask and I will likely produce it for her. Sometimes bigger toys go on "vacation" when she asks for another big toy, like a car or rocking horse.
If you receive toys that are simply not something you want your children to have, leave them unopened at the time of receiving them. Chances are, your children may forget about them. A friend of mine returns toys like that to the store. She's brave! I have been known to get out a few of a multi-part toy (like a tea set) and get rid of the rest. If you have a family member that is especially concerned with whether or not their gift is being used, store it away for when they come to visit.
For items that I am wanting to eliminate, I am careful not to upset my child with this choice. I will sometimes store things out of sight for a time and wait for her to ask for them. If she doesn't for a few weeks, I consider it safe to get rid of them. It's a fine balance to eliminate clutter and respect your children at the same time, but it can be done.
For the loud toys, let the batteries die or just trash them. I have come to see that many toys are not needed--my oldest (the only one currently playing with toys) comes back to the same things repeatedly. Keep the favorites and leave the rest for the garbage man or donate. Any toy can be open-ended in a child's eyes, so creativity will surely pick up with fewer things around.