No, you can't. If you have a DS with a GBA slot and a copy of Friends of Mineral Town or More Friends of Mineral Town you can connect the two games by having it inserted into the GBA slot. But you can still not go to the town. Mineral Town characters can visit your town but your character can never visit Mineral Town. No matter what you do.
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Muffy is not a character in Harvest Moon: Friends of Mineral Town.
On Harvest Moon: Friends of Mineral Town/More Friends of Mineral Town, you have to connect to a gamecube copy of A Wonderful Life/Another Wonderful Life. Van will visit Mineral Town every Wednesday and set up shop in the inn.
No. Friends of Mineral Town is for the Gameboy Advanced only. But you can get Harvest Moon: Boy & Girl for the PSP or Harvest Moon: Back to Nature from the PSN store. Those games have the same characters as Friends of Mineral Town.
Nope.
No. You can connect those games to A Wonderful Life/Another Wonderful Life and or Harvest Moon DS/DS Cute. But not to each other.