Namespace and mosaics - costs - address question

question 2 - what i understand you create a namespace wich is like a domain name under nem

some things are not clear to me

asume i make the namespace jasmine20 - that jasmine 20 has an addess - people can send and i can send and receive nem

I understand that when people pay in nem they can add a comment - we have some nem on poloniex and we got first a comment - than the poloniex adress

my questions are:

is a name space same 1 number used for send and receive ?
in the comments you make the seperation or details from the payment is that correct ?

Also i wanna know the costs for send/receive nem or the % per transaction

I understand you can have mosaics - subdomains under a namespace
assume namesapce is jasmine20 and i got 5 subs

car
garden
shopping
household
business

do all those 5 mosaics have 5 seperate addresses ? or will it go through the main jasmine20 account and will be listed as different payments ? or can they for example used as 5 different coins

or is the namesapce also 1 coin ? or can you make 1 namespace - jasmine20 in this case
and make garden coin shoppingcoin etc …

Another question is the price is 100 nem for rent but is that for a certain time period ? or forever ?

A lot of questions I hope there in the right category and also clear Hoing for some help and info Thanks
for reading

IMO you missunderstand namespaces.
You can’t send there something. It’s uses to give unique names to mosaics for example.
You are sending transaction to address with starts N in mainnet and T for testnet.

Please read this: