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Side work and managing finances?
I have done similar software work. You do not need an LLC to write off business expenses. The income and expenses go on Schedule C of your tax return. It is easy to write off even small expenses such as travel - if you keep records. The income should be reported to you on a 1099 form, filled out by your client, not yourself.  For a financial advisor you should find one you can visit with personally and who operates as a "fee-only" advisor. That means they will not try to sell you something that they get a commission on. You might pay a few $hundred per visit. There are taxes that you have to pay (around 15%) due to self-employment income. These taxes are due 4 times a year and paid with an "estimated tax" form. See the IRS web site, and in particular schedule SE. Get yourself educated about this fast and make the estimated tax payments on time so you won't run into penalties at the end of the year.