2012 tacoma 4x4 ex cab base very noisy inside

Ive been reading thing on here for a lkng time now just decided today t ok actually this "community" if you will. Anyway recently picked up a 2012 tacoma. It has 110,000 miles. It runs great n drives okay. The suspension is def worn (what exactly idk in time i will slowly replace what is needed). When i picked it up it was extremely dusty, inside n under the hood it was used as truck probably but nit beaten. Never had a tow hitch in it (its a 4cy 2.7 so im actually happy about that) and its interior cabin filter showed what it has been thru for the past couple years (it liked like it was never changed n there was even a couple leaves in there however on the side of the filter was date that had the year 2016 so it couldnt have been more than 2 years old since it was changed which led me to believe it was def in a very dusty situation all the time. Maybe even a company truck or something but the bed shows no signs of wear no scratches on the sides of the truck to think there was a cap that holds tools or anything like that. I live in north east pa n there is very little rust just some little normal surface rust under it where it is on every truck thats 7 years old n its in excellent shape under there for this area and age.
2 things that bother me about it.
1, the truck makes a ton of random noises inside, not tire noise or road noise, like seemingly every single thing inside rattles or makes noise, it does have jump seats n maybe thats part of the reason as they are right up against the back of it idk. Is there anyway to take some of the panels off n maybe add some super rhin weather strips or something? Idk if there is a better soultion as i know nothing about trucks minus the easy stuff.
Also, when the truck starts at least when its cold it makes a strange noise about 30 seconds after it is starting, kinda like u shook a soda bottle maybe n opened it or like some kind of combustion type sound idk how to explain n just wanted to know if it was normal.
1 last thing, front struts, i plan to change the shock all around the rear i can handle the front should i just get done at the dealer as i want oem stuff i dont plan on doing anything crazy to it and just want an awesome second vehicle. Also, option 2 would be to take it apart n run the parts over to a mechanic maybe n have him put the shock in the coil maybe?
Any help would be awesome and im excited to own this truck and be part of this forum thanks for any advise.

 

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The noise on startup is normal. It’s something to do with emissions.

 

Thankyou

 

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Welcome to TW!

 

https://www.tacomaworld.com/threads/sound-deadening-doors-with-raam-audio-products.264146/

 

Welcome from AZ!