Space marine guidance

[manrogue]

As some may know, i am knocking together a space marine army for the first time in years(literally!)
I was just wondering if someone could give me a little guidance on the basic army selection i should be going for?
obviously i will tailor it to my tastes after a few games give me a idea of my tactics and such, but any help would be much appreciated!
Through going through my loft and online purchasing i have currently-
1 x captain in terminator with storm bolter and power sword
1 x librarian
1 x apothecary
aprox 20 x marines with bolters
2 x marines with heavy bolters
3x marines with plasma cannons
3 x marines with lascannon
3 x marines with missile launchers
1 x marine with multi melta
1 x dreadnought with assault cannon and close combat weapon
1 x dreadnought with lascannon and missile launcher
5x assault marines
1 x razorback (twin linked lascannon or heavy bolter)
8 x terminators (2 with heavy flamers, 1 with assault cannon)
plus other bits which i am finding daily through searching through loft when have spare moment
Also have just had black reach set turn up so whatever stuff is in there as well.