Welcome to addictive co2 world,
I found co2 system setup shouldn't be too difficult as you might think, but it's not too easy either. As long you have baseline of what kind of system you would like to have, you should have it tried.
Based on few options that i had tried, low pressure system like ceramic diffuser is less problematic, compare to some options that require more pressure such as atomizer, or bazooka.
Though in the end of the day, some time we tend to try some other options in the name of better co2 distribution ,with better plants growth and result sake. While You hit by some issue, leak, etc, but that's experience you like to get, just enjoy it.
Best place to purchase, i'm not sure where will it be in this island. I got mine initially from mizuworld, due to they sale in package and delivery service but everything got changed / upgraded here and there so nothing left right now. I used to top up my gas from seaview. They have a lot of stuff to build up the system, but I'm not really sure if they are the best in term of price.
Good luck
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