Firestar stated that in Firestar's Quest, he loved Spottedleaf, but now Sandstorm is his true love. It has not been confirmed, because it has been hinted that Spottedleaf is still in love with him.
Yes, Fireheart developed feelings for Sandpaw as they grew closer while working together. Their relationship evolved over time and eventually led to them becoming mates.
Yes, I know it seems impossible in the first few books that they will ever develop feelings for each other, but their relationship begins in Rising Storm, and are clearly mates by The Darkest Hour. Fireheart saves Sandpaw from falling off in a gorge during a border fight with Riverclan and Sandpaw starts to love him.
NO.
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Fireheart's apprentices were Cinderpelt, Cloudtail, and Brambleclaw.
Sandpaw does.
Firepaw becomes fireheart in into the wild and later in the darkest hour he receives his leader name firestar (after Bluestar dies).
Fireheart is a loyal, trustworthy cat. He is also brave and very protective.
Brindleface is Sandstorm's mother (Redtail is her father)
The cat on the cover of "Rising Storm" by Erin Hunter is Fireheart, the main character of the Warriors series. He is depicted standing on a ledge, looking out over the ThunderClan territory.
For your screenname, just type in fireheart. If you can't get it, that means someone else already has it.
Fireheart's sister Princess, offered one of her kits to him so that it could train to become a warrior. Fireheart ended up bringing Cloudkit (Later Cloudtail) into the clan :)
There is no indication in the Warrior Cats series that Smallear and Speckletail were mates. They were part of the same Clan and had a friendly relationship, but there is no proof of them being mates.