Hey friend,
Do you have any plans for how big you want the plants to get? Pot sizes...3/5/7 gallon? Also the blueberry obama is a limited strain...so it might be good to grow 1 of that and just makes some clones if you like it, to not go through all the seeds quick.
I would personally opt for 2 larger plants versus 4 smaller ones... possibly 2 with a 7 gallon pot? The end harvest might be bigger, give you time to practice some of the basics, transplanting/training/cloning. And sometimes handling 2 plants can be a fair amount of work, and more plants even more so.
But if you have heart set on 4, I'd go with 3 or 5 gallon pots and keep the veg time down to 6-8 weeks with some topping and lst.
Good luck with the 1st grow, always an exciting time regardless of which way you chose.
*but definitely snag a clone of each plant and label them, that way you can keep the best ones.✌️