There are several Wii threads floating around, but it's okay to have your own as well if you're not finding the info you need. Buying a system for the first time can certainly be intimidating especially because there is just so much STUFF you can get for them nowadays! I absolutely love my Wii and I'd be glad to give you whatever help I can, I'm just not exactly sure where to start. Are you looking for game suggestions? Or are you not sure what accessories you may need to buy?
Another thread that may help you is this one:
http://www.disboards.com/showthread.php?t=2317693
Several people said the pictures helped them understand a little better what was what.
As far as what you absolutely NEED to have:
1. Wii Console (comes with 1 remote and 1 nunchuk)
2. Extra remotes (if your family wants to play all together you can have up to 4 remotes, but not all games that allow 4 to play have all 4 playing at once, so you can pass a remote off when your turn is done)
3. Extra nunchuks (same rule as how many extra remotes you feel you need)
That is it as far as hardware you absolutely need, and then the fun part is the games of course!
Here's what games I suggest for families:
1. Wii Sports Resort (this game requires the MotionPlus so you will need that accessory for each remote that wants to play this game)
2. Mario Kart Wii
3. Zack and Wiki: Quest for Barbaros' Treasure (only 1 player, but fun for everyone to watch and help the player with the puzzles, or you can alternate players from level to level)
I think these games are great for the whole family to be able to enjoy together. There are also lots of wonderful other games that I'm sure people will be along to suggest that your family would enjoy as well. Please let me know if you have any further questions, I'd be glad to help!