EMU / Rpi3B Noob help please!!!

[foreverclumsy]

First off, thank you for taking the time out to clarify some questions I have. I really do appreciate it. I literally just got my Pi in the mail from Amazon and plan to build a gaming console for my family this weekend. I have a few questions that I am confused about.

Game plan:

- Raspberry Pi 3B
- 32gb c10 microsd
- 128gb USB 3.0 flash drive
- 2 controls
- install Retropie v4.1
- downloaded NES, SNES, N64 full romset
- heatsinks



Questions:

- I would like to download and install MAME romset. Why on earth are there so many listed on emu paradise? I am completely lost as to which one(s) I need to run with retropie v4.1. Do I need to download them all? Or only a specific one to run. I am aware there are a few different emulators within retropie that can handle MAME games. Is there one that excels over the rest? Where can I locate romset needed for said awesome retropie mame emulator? I've seen people link this page but it looks completely foreign to me. Fork? BIOS? DAT? clrmamepro? HUH??? I've googled/youtubed around and can't seem to get a clear breakdown answer. Sorry. I am trying my best to learn/understand everything. MAME has me stumped lol.

- Anyone try running their roms via the usb flash drive vs microsd? Is it worth doing? link

- Would you advise getting a fan installed on the rpi3 necessary for playing all the games?

- Anything that I am missing or would benefit from that I haven't purchased, linked, downloaded, etc?

[pix07]

ask me im understand this guide its simple or just get retroarch set whichcore you use and download roms from here
dat files are "info" about avaible roms nebula use the same way so without dat files its not posible to play roms becuse are unavaible
every romset is for correct mame version so set for older mame maynot work with new version bios must stay in folder with roms mame detect is bios correct
mame emulate every arcade machine so if you want play neogeo or cps2 you need bios
about your fan i read it on amazon if not heat too much is not needed
about micro SD vs usb disk micro may be faster than usb but its easy to broken you cant recover flashcard but you can fix usb so your choice:
stability(usb) or speed and risk and im dont recomend sd i was have a sd card can be broken easily like :bad write mean you copy something but there is no electricity or something broken in pc like frozen os and you cant copy etc etc...
recomended emulator is retroarch choose core from there retroarch run every console :
http://emulation-general.wikia.com/wiki/Libretro#Cores
https://github.com/retropie/retropie...-configuration
http://www.libretro.com/index.php/ge...ith-retroarch/
https://gameroomsolutions.com/raspbe...up-easy-guide/
https://www.raspberrypi.org/forums/v...ic.php?t=56070
thats all now have fun
and sorry for late answer i was have hope that someone help you