The only limit is your mind. If you think its impossible, it will be for you.
Your objective is big (which is a good thing) but you might be discouraged to know that you will have to work for it and make sacrifices for it. Most people think that money will just appear in their living room after doing a spell. You have to work for it. Spells, demons, angels, spirits…etc facilitate the result, they “boost” your results or give you unexpected things, but you have to work for it.
I have worked with Seere in terms of money. He is awesome for beginners and works bast. I’ve heard that Clauneck is a good option too. Anyways, you should do your own research and see which spirit is best for you.