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What is your intended outcome? Do you want to just make money or do you intend for it to make you financially secure?

B. has given you a great answer as you don't even need any specialised equipment. Another idea could be to plot the the four Galilean moons, of Jupiter. All you need is good pair of binoculars and a pen and paper and a few nights to observe. (of course you will have to check the ephemeris of...

[It might help to read up on these things first.]

Keep your legs closed. That will solve a lot of potential problems.