Agreed, I recommend getting used to the phone 1st. Find out your likes and dislikes. You may like the stock ROM and just want to add programs, clocks, etc. You may not like the stock ROM and want to flash, and then you will end up like me and be addicted to it and it will eventually consume you, lol.
Sooo, IF you do decide to flash, do A LOT of READING 1st!!! READ, READ, READ!!! Most any of your questions have already been answered you just have to look past the 1st or 2nd page sometimes. Check out some of the ROM available, each are unique, some more stable than others, some are loaded roms packed with apps, games etc. Some are CLEAN Roms, or LITE edition, usually those are for someone who just wants a fast and stable rom that they can add to IF they want and that way they can choose what goes into the ROM. My advise is read, take a look around, do your homework, lots of info on this site alone. Good luck to ya, anything I can do let me know
. Oh, and be sure to thank anyone who helps you along the way. Not by typing it, hit the thanks button and it will be much more appreciated