Hi! I'll give you a little guidance then!

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First things first, You say you want to be WHM! So you'll need some proper sub jobs! I suggest taking BLM to 18, Then unlocking your Support job, Quest found here: http://wiki.ffxiclopedia.org/wiki/Elder_Memories

After unlocking your Support job, I recommend Leveling WHM to ~30 and unlocking SCH! SCH is a very useful support job for WHM in a lot of situations, Quest here: http://wiki.ffxiclopedia.org/wiki/A_Little_Knowledge

After unlocking SCH, take it to level 45, Then RDM to 45, and BLM to 45, Then you'll have the 3 best WHM subjobs leveled and Ready. Now you'll want to try and take WHM to 75~90, whichever you feel comfortable with. This should be easy for you.

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Afterwards you want to focus on Missions! I suggest starting with "The Rise of the Zilart", Missions found here: http://wiki.ffxiclopedia.org/wiki/Ca...ilart_Missions.

These Missions are pretty basic, and give you access to Ru'Aun Gardens, commonly known as "Sky", while not a big part of endgame, its nice to have access for when its needed. Plus, it gives you access to Divine Might rewards.

After that, i Suggest moving on to Chains of Promathia. Missions here: http://wiki.ffxiclopedia.org/wiki/Ca...athia_Missions. These are also much simpler these days thanks to being uncapped, All of this will give you access to the area referred to as "Sea". While like Sky, not used as often, its still nice to have access too. Plus CoP Rings are regarded as some of the best reward rings. (Namely, Rajas Ring)

After that You'll want to look into Abyssea, gather you Empyrean +1/+2 Armor for WHM, which is actually rather easy when it comes down to it, just takes time and dedication!

After that pick your goals where you see them!