at the start nobody can tell u for sure what turns out to be strong, we can only predict what could be good but time will tell. if u wanna be safe craft a cheap aggro deck for the beginning and wait 2-3 weeks till the first meta settles. than u can invest u dust in what is actually strong
My recommendation would be to simply wait and try to avoid crafting cards from Rise of Shadows, Saviors of Uldum, and Decent of Dragons since they're all going to be Wild cards in four months or so.
With that being said, Soul Demon Hunter is top tier, cheap, and contains some of the newer cards. This would be your best bet if you want to jump right into the fray. You would just have to hope this doesn't fall out of favor when the META inevitably shifts.
I always wait a few weeks before making any expensive crafts, but that's just my opinion.
Welcome back! Tbh, this may not be the best time to start crafting decks. 3 expansions will rotate in April next year meaning the meta will change entirely. Very few of the current decks will be around then. If you can wait then my advice would be to craft one reasonably cheap deck now and sit on your dust until next April. My suggestion would be something like Soul Demon Hunter or even just Face Hunter. Both pretty cheap and very strong right now.