I'm new to this forum and new to bonsai-keeping. I'm not crash hot at keeping plants alive at the best of times (I've sent a few home to my mum to be nursed back to health) but it appears that keeping a bonsai alive is even harder.
My boyfriend bought me a beautiful 8 year old bonsai about 3 months ago for my 25th birthday. He was told that it is one of the hardier varieties of bonsai and so we were hoping I might be able to keep this one going. I have followed the instructions that came with it (not too much water, not too much heat but some sunshine) but it appears to be dead or nearly dead

I'm wondering if anybody is able to tell me what type of plant it is and what I can do to bring it back to good health (if I haven't killed it!).