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White Rabbit,
Good first attempt.
With this particular nebula, if you expose for longer, no matter what ISO you use, you will burn out the core; it is just too bright.
I've seen two fixes to this issue:
1. don't bother; just leave it as it is;
2. take shorter exposures of the core and super-impose over the top of the correctly exposed nebula using masking in applications like Photoshop.
Keep going -- it's a very steep learning curve. Taking images is half of the battle (and this is assuming that all other variables such as weather and functioning equipment is swell), the rest of it is in post-processing.
Regards,
Humayun
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