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Hi, I'm new to the PS3 modding scene and I've got several questions that I'm hoping somebody can answer

I have a CFW PS3 with REBUG 4.70.1 D-REX. Sorry if some of the questions are nooby and stupid.
1. I've read that a spoofer is not required if using DEX, is this true? If so, how do I spoof my ps3 with the DEX firmware and can SEN enabler be of any use to me in lowering my chance of getting banned? If it's not true, would I just use SEN enabler to spoof my ps3 to 4.75?
2. What measures can I take to prevent myself from getting banned? So far I've read that I should change my active ps3id to CEX, use psninja to wipe history, and use pspatch to disable syscalls, to avoid getting banned. Is there anything else that I can do that I'm missing?
3. If I do the above and change my active ps3id to CEX, use psninja to wipe history, and use pspatch to disable syscalls, will I still be able to mod? I know I won't be able to use my homebrew apps, but will mod menus and RTM'ing still work? If not, what would I need to do to keep modding functionality while still minimizing my chance of getting banned as much as possible?
4. If I wanted to just play normally without modding, could I make my disguise my ps3 as an OFW to prevent getting banned?
5. Can I use both TMAPI and CCAPI if I have my PC and ps3 both connected to my router? Or do I have to connect my ps3 to my pc and bridge connections?
6. How can I install a game on my ps3 and use it with multiman if I have the ISO? Do I also need any additional files for compatibility?
7. My hdd is only 120gb, so if I wanted to have several games, how could I go about storing them? Could I use an external hdd and play my games off of that?
Please answer any questions you can, I would appreciate your input. Thanks