It's perfectly fine if you are not willing to make big UTG bluffs if you feel you are not ready, it'll come when a better understanding of the game will emerge from your experiences.
Start by opening up from the button and, once in a while, attempt to steal the blinds when folded to you with hands you would normally fold. Your aim isn't to play them to showdown (unless you flop something, like a top pair that has some showdown value, and obviously a monster hand), but pick up the dead money, in essence, bluffing your way to win preflop or flop pots. If raised back, just fold and move on. If called, look for good boards to make a half-bet continuation bet on : disjoined boards like K84 or rag rainbow flops. If they float/raise/play at you and your read is that you are beaten, check/folding is okey, and the more you gain a feel about your opponents and the game, the more you'll feel easier about double-barreling in spots that allows it credibly.
Also, start to have a feel of your table dynamics. If most people play passive and fold often to raises, start stealing blinds from the CO or take shots at the pot even more often from the BTN. I allow even myself to open-raise UTG with low suited Aces or trouble hands like KJo on tables like these. If you feel people, especially in the blinds, call/raise you often tighten up for a while until you feel you can start again.
During downtimes, take notes and reads to identify the players' tendencies. Try to know which hand they raise and play with, how they play the three streets, if they overplay theit TPGK on a drawy, flushy board, if they tend to fold to cbets or double barrels if they don't improve, if they go AI with smaller pairs, if they tend to check-raise with air, etc. These will help knowing which range they tend to play with, and from these you can expand or retract your own range AND have a feel on how to play postflop with them, even if called with your marginal hands.