Hi back to you. Welcome to Flyertalk from one who is still a newbie himself, but has learned a great deal from older hands.

First, decide which one airline you want to concentrate your miles on. Go to that airline's website and if you haven't already done so, register for it's FF program. Remember your number; you'll need it for next steps (and it can take several weeks for your FF material to be mailed to you). Second, visit http://www.mileageworkshop.com Look through all the deals there. Sign up your phone with a tie-in to your FF account. You'll get a signup bonus. Consider a credit card linked with miles to your program. Check back on that site every couple of weeks for new stuff. Third, do you stay at hotels? Then go to their website and join their programs, noting in the preferences that you want credit for stays to be posted as bonuses to your FF account of choice. Fourth, in FlyerTalk, regularly read the board of the specific airline you're concentrating on for occasional "specials" (miles for surveys, etc.) Fifth, when you're logged in to that airline's board, do a "Search" on topics such as "Free Miles" and read old threads for any old freebie links.

Others will doubtlessly have even better suggestions, but those are for starters.