Need tips to begin my journey to Haven glory

So, I'm a recent full convert to Shadowverse. I started maining sword to get the hang of the game and have been enjoying it.

Typically, I like to vacillate between a fast deck and a control deck. I've been having fun with sword aggro, but haven, specifically seraph haven, seems really fun and is calling to me. It doesn't hurt that Haven devotees (along with shadow) are pretty fanatical around here.

Haven prebuilt seems like a bad buy. Don't really want to be a Moon or J'eanne deck.

I've got around 7000 dust available and not a ton of Haven cards. It seems like my course of action should be to craft my Elena's and themis's, and then start grinding to 2 Seraphs. Does this sound right? How do Elena seraph and straight seraph play out different, and should I just go for the full set of seraphs for straight seraph? I'm pretty sure I can scrounge up enough flasks to do the set plus the decrees I need.

Appreciate your help! Overall I'd like the deck to be decently competitive, but fun is the real deciding factor. And kicking Daria's ass.