Hey welcome to BA! First of all, what other models do you have and what are you willing to spend? Have you played other armies previously? Finally, how competitive are you looking to make this list? Just so we have an idea of how much we can change.
Until then, here are some basic comments.
I would (if possible) substitute the captain for a libby or even a reclusiarch (though that's a bit more) as the captain has a distinct lack of weapons. His statline is good, but without any gear the buffs provided by the other two are infinitely better. Not to mention that DC + Reclusiarch = a great deal of baddassery.
If you put your DC in a rhino (or any other non-assault vehicle transport) you should give them all bolters (as they can't assault right after they charge, and they're relentless so...) and regardless give the PF/TH guys bolters (because relentless).
Does your RAS have any gear?
Furioso is cool, but now it's AP 3 so make sure you steer clear of TEQ.
I'm assuming raven has an AssCannon? Just a note, it's not technically a dedicated transport it's a heavy support, though it can still carry them.
Overall: Your list isn't particularly unified. You have lots of cool units, but they don't really work together. A DC deathstar is nice, but much more effective in a LR etc (maybe even in the raven?) Tactical marines are good but they should probably have a transport. Assault marines are phenomenal but in a five man squad with no upgrades they won't be able to accomplish very much.
Hope I've been at least a little helpful, GLHF with BA, they're really a fantastic army both for fun and (if played right) effectiveness.
If you go down to the woods today, be wary