Hello and welcome to
40K!
You're looking for codex: space marines this one -
http://www.games-workshop.com/en-US/Codex-Space-Marines-2015-ENG
And there is a primary detachment in there called a gladius strike force that lets you combine formations in the codex.
The primary formation is the Battle Demi-Company - and its exactly what it sounds like, half a company of space marines led by a captain which you have (almost)
Battle Demi-Company
1 Captain or Chaplain
0-1 Command squad
3 tactical squads
1 assault, bike, attack bike, land speeder, or centurion assault squad
1 devestator or centurion devastator squad
0-1 units of dreadnaughts, ironclad dreds, or venerable dreds
That should cover a little over half your list and there are more formations to include everything else you want.
Terminators in a landraider is always fun (maybe not the best these days) but don't let that stop you! (I do it still)
Your apothecary would be in the command squad.
Do yourself a favour and download the free army builder app battlescribe here
http://www.battlescribe.net/ when you make your list it also comes with some of the rules and helps you make lists a lot faster.
When you make a new roster Add a Force from the Catalogue: Space Marines: Codex (2015) and the Force Type '
SM Gladius Strike Force' OR 'Formation detachment' (if you want just a group of formations) OR a 'Combined Arms Detachment' which is the classic 1-2
HQs 6 troops, 3 fast attack, 3 heavy etc (but I suggest use the formations for the benefits they give you)