Ok..I am back...
4) Substrate...If you want plants, then your substrate needs to be good...if fish only then just get some gravel
5.) Dosing....with plants, you need to be thinking of dosing some ferts in the water column and/or get some good root tabs
6.) Filters..your need a good filter with good flow and filtration. This is another area you don't want to go to cheap on
Just remember...you get what you pay for and this hobby can get quite expensive. If you try and go cheap, be ready for problems. Do plenty of research and ask questions. Learn what the nitrogen cycle, the difference between T5, LED, CF, Etc lighting, how is your water and do you need to get a RO/DI filter. There is alot of information out there and you need to sort through it all and make some plans and conclussions on what you want to do. Good luck and enjoy the hobby!