After a long absence from the game its only normal to feel detached from the game,
just remember your mind has a memory of all previous play-through so if you take the simple approach of just putting some time into the game everything will start coming back to you.
- You can take the direct approach and do the main quest line .........and reinforce the idea of being the Dragonborn, witch in time will reinforce ideas like having a purpose or a Destiny
- or simply join a faction and just focus on that quest line, The Companions is a good place to start & it gives the sensation of a new comer who eventually learns all the skills to become the Harbinger & all the glory that goes with it.
- or simply just explore Skyrim ..........pick a direction and just start exploring this beautiful SSE land.
As for fast leveling / below is a list of skill trees that will help you level fast (and you wont have to use exploits) and you dont have to go into combat to get them up to 100
Smithing
Enchanting
Illusion
Alteration
Lock-picking
Pickpocket
Speech
Alchemy
just make sure that you don't waist all the perks gained, put them into your main build Example if you are a warrior .......all perks gained from the above list go into your warrior build
if you multi task and use smithing to make things & then enchant them and then sell them you will have heaps of money to buy TRAINING skills for your build, 1 x handed, blocking ext
so by working on NON essential skills & combined with training you MAIN skills you will have at level 30 a strong base to start killing everything on site (depending on difficulty of-course)
hopes that helps you a little ............the above are just my recommendations
BUT you will eventually will get some more information from the BETH members with some amazing ideas & strategy ...........this place is a wealth of KNOWLEDGE
have fun & may all your battles be glorious