It Will Come Back
Gaming isn't a skill as much as it is a process. The skills are acting, mathematics, language, and carousing... the game itself is just a process, and that will come back readily. Every "ex-gamer" I've met who decided to try again was back into the flow within the first few minutes. Ex-Game-Master isn't so easy... but Ex-GM's who come in as players often are back in the swing even faster.
Option 1: Find a group
Using either a local meetup board, or a local gamer board, or your local game store, put up a notice you're looking for a group. Be prepared to learn a new game engine... and in some cases, a whole new way to approach the gaming.
Option 2: Make a group
Find some brave friends, a set of rules you can run, and pick a time and date, and, with no obligations to continue, give it a go.
Option 3: Find a Con or Demo
Find a convention. Sit and watch a few sessions, and then see what's open. Local cons are actually better than big ones - most of the people will be fairly close, and if you are fun to game with, you'll get invites.
Demos at local stores may not be common, but ask the store to let you know when there is going to be a demo. Show up, play, and see if the others there are fun to play with.
What's Changed in gaming???
Very little, and yet, everything.
There are a lot of free games on the net, download, print and play.
A number of games still follow the dungeon crawl, "Kill them all and take their stuff" (KTAATTS) mentality. Many now have a focus more on story-support.
Mechanics now have a much wider range of both complexity and styles of resolution. Some you resolve the action; others whether or not the intent is accomplished, others still who gets to pick the outcome.
Likewise, there are more kinds of dice now.
- The Standard Die is still the six-sided cube, either numbered or pipped.
- The standard polyhedral set is still 1d4, (1 to 4)d6, 1d8, 1d10, 1d12, 1d20, and may have a 1d10x10.
- Fate and Fudge based games use "Fudge Dice": d6 marked "–" on two sides, "+" on two sides, and with two blanks
- Funky polyhedrals are available in 1d3, 1d7, 1d14, 1d16, 1d24, 1d30, 1d50, and the infamous Zocchihedron 1d100 "golf-ball"
Fantasy Flight's Warhammer and Star Wars use standard shapes, but with unusual markings. The dice tend to be a group asset.
- A few have no dice. Some use cards in place of dice, others use pools of points, several use variations on Rock-Paper-Scissors (or Rock-Paper-Scissors-Lizard-Spock) others still use no randomization at all.
Lots of people use computing devices now - spreadsheets for character generation are common, many games are sold in PDF in addition to or in place of physical books, and dice-rolling programs are readily available.
Pretty much any system you used to play is likely to still be out there. The best advice on getting back to gaming is "to do it, just do it."
The variety of systems available now may suggest that you should see if you can try some one-shots. Another good reason to go to a local convention.
Don't be afraid to fail - if you find a group, but the group isn't fun, try a different one.
And, as Dave Hallet notes:
The upshot is: if you want to find games that feel just like the ones you used to play, it won't be hard: nothing has really gone away. On the other hand, there are a lot of choices that didn't exist even a few years, and many of them are worth checking out.