I need help listing my clothing brand on Amazon

I have a semi-popular clothing brand and people always ask to list it on Amazon but I keep running into issues since I have no clue what I’m doing inside Seller Central.

Is there anyone willing to get on a live call with me to walk me through the following?

Things I Need help with:

1. Amazon Brand Registry: I have 2 trademarks that I’ve been trying to get registered and I think one was completed because I got an exception that allowed to me list items without a UPC for each variation, saving me a ton of money. However this listing is no longer live because Amazon thinks the images contained a mannequin (which they don’t). I need to figure out the best way to change all of the images. It seems like I have to manually change it for each size/color variation which will be a pain…

2. Infringing Seller: I need help taking down items from a seller infringing on my 2nd trademark. I’ve started the process and might be close to completing it but I’m still confused if I did it right… I need help with confirming what the right next steps are.

3. List my remaining apparel: I need help listing about 200-300 items similar to the first one that went live for a brief period. I need to be efficient and accurate when listing this many items and I also need to figure out how to list them again without paying for a UPC code for each SKU.

I know this may be a lot to ask for, but I’m a quick learner who just needs a little help from someone with more experience. I’d be very grateful for any help. Thank you!

Edit: This is all for FBM