Hi there! If you have no experience at all with trading stocks your best bet is to use a broker who can submit the trades on your behalf. When using a broker you open an account and provide them with the money to invest on your behalf. There are a number of discount brokerage firms you can work with. Before meeting with the broker I recommend doing your homework and trying to determine what kind of companies you want to invest in. Questions you should ask yourself: "Am I a risk taker?" "Do I want short term gain or do I want to stay with a stock for a number of years?" (This is known as "going long" on a stock.) In other words your personality will play a role in the decisoin making process. There are a number of free online courses and yes, even vides on YouTube, that can help you with your research. Look at the items you buy in your day to day life and ask if yourself "Is this a company I want to invest in?"
Also consider picking up a print copy of a recent edition of the Wall Street Journal. Don't read it online, actually buy a copy and read through it.
If you do go with a broker make sure to listen to them, but don't let them force you into any particular stock you have not done your own research on. Ask for the prospectus about the company they are recommending and review it.
Hope this helps!