Like yourself I was a neophyte homeowner some 40 years ago and one of the very first issues I had were clogged sink drains. Money was tight, ignorance ran rampant. however one of the most valuable tools which I purchased was a Milwaukee electric drain snake with a 1/4-inch 25-foot cable which has since been upgraded to a 5/16-inch diameter 35 foot cable. Yes, you can call a plumber in however you will pay dearly not because of the plumber's greed but his cost for tools, insurance, gas, and whatnot. More importantly, you will never learn but will be at the mercy of contracted help. If money is tight rent a electric snake at your local Home Depot. Besides using this tool to clear your immediate clog it will allow you to also perform preventative maintenance on all your other drains. If your spouse is like mine you will eventually have sluggish possible clogged drains in the future simply because of hair and other materials which will clog periodically. I spent $350 some 40 years ago for a Milwaukee electric snake and it's paid for itself dozens of times. My assumption is your clog is further down the drain so a 25 foot electric drain snake is your most likely fix. Avoid using caustic liquid cleaners as they are "all" a waste of money. After your clog is resolved be sure and use lint and hair traps, avoid disposing grease and food down any of your drains and learn to love pasta. Why pasta?..... the hot pasta water is fantastic when used as a preventative drain cleaner poured piping hot down your most recalcitrant drain...works for me!