I recently started Skyrim as a heavy armor wearing, sword and shield using, Nord warrior* who's only "guild" focus will be the Companions. I've done my first mission for Aela, but I've sort of been doing a bit of this or that, and haven't yet visited the Greybeards for the first time. Since the Companions offer "free" training in all the combat skills most important to me, I'm thinking my best strategy now would be to focus on completing the questline so I have access to them as followers, build up my combat skills, then get back to the main quest and sidequests.
Getting Red Raven's sword has been a big help in fighting undead, but my relative trouble killing Kvenel the Tongue (I died three times before I figured out that I needed to avoid fighting him and the undead sorcerer at the same time...), made me think that I need to build up my combat skills as much as possible first to avoid these problems. (I still feel that it's a tad much that he was not only immune to undead strategies but had waaaay too much health.)
Also, while I love the fact that Skyrim has a ton of quests, I'm racking them up a bit fast for my taste and I'm considering focusing first on the Companions, the Main Quest, then the DLC expansions and saving most, if not all, of the other quests for last. Good strategy? Any help would be appreciated.
*I'm doing a massive Oblivion/Skyrim roleplaying playthrough based on the three archetypes. I recently play Oblivion as an Imperial Knight (custom of course) who focused on all the warrior stuff and being the hero of the main quest. After I beat Skyrim with my Nord, I'm going to play a mage in Oblivion, then play one in Skyrim and then move on to a thief/assassin build in both games. Just FYI.