Hi, welcome to the reefing world. 1) For the tank size limitation, I think is better to check with your local authority as different country got different law. 2) My suggestion is start with small and docile fish first and slowly increase. You fish list mostly will change after you start to know more about this hobby. 3) Angel and Butterfly mostly is not reef safe so you need to check before you purchase. 4) For Tangs, if you want to add similar species it will be better to add them all together instead of one by one. E.g. purple, yellow, gem tang should be add together for higher chance of success. 5) Over here, most of us don't use heater. we use chiller only. 6) I will recommend you to setup quarantine tank for your fish and coral if possible. 7) Check out 静风听海 at taobao.