Technically, multi-accounting is against Nutaku ToS. But practically, many do it and I've never heard anyone getting banned for it. It's pretty much the only way that you can spend your BP outside of Raid events anyway.

And speaking of raid events, we're about to get Barong. Raid events are the best way for new players to grow strong, so good luck for you there~

After you've been part of one raid event, hopefully you can find a decent Union and partake in the next Union event, which will feed you a ridiculous amount of weapon/eidolon fodder. Around that time, you should be in decent shape.