I suggest as well that you check out my thread where i collect peoples experiences and success stories on magick, as it often can provide some ideas for your own workings, along with figuring out what is actually possible in magick. Determine for yourself what the limitations of magick actually are. Best way to do so is to actually read peoples success stories. Something can’t be “impossible” if others before you have done it.
As for Dantalion, he could work. Ive never used him but i advise that you pick one and stick with that one entity. A common mistake by newcommers is to call on half the goetia for their simple problem, thinking that adding more = better. But really it just shows a lack of confidence in the spirits to do the job, which is counterproductive