Yes, exactly, there are many ways to mix it up and determine the frequency. For example you decide that you will use 97 as a bluff hand, or narrow it by making it 97s, or narrow it further by making it 97 suited as long as the suit is black, or that you will use 97 of spades only.
If you raise and just one opponent calls, possibly the BB, if he has an unpaired hand, then two times out of three the flop will miss him. If he is BB, he must go first, so if he checks to you, either he does not expect to take the pot down on the flop, or he is planning to check raise. Usually it is the former and he will fold to your bet.
If he does call, then we are on to plan B which will be determined by the texture of the flop which will give you an idea of what he is holding.
If you are suited and there is just one card of your suit on the flop, then any card of that suit on the turn will improve your hand significantly as it gives you the flush draw, especially the Ace, because that rules out the possibility that opponent has a suited ace in your suit, and so will any 9 or 7, and if there is a Ten or 6 on the flop, then any 8 will help you to, so that is possibly 20 cards that might improve your hand on the turn and give you the odds to see another card on the river.
Because you raised preflop, any Ace that falls on the table is going to scare your opponent if he does not have an ace and his behavior should be studied for that as you may be able to represent an ace and take down the pot. Consider the possibilities–he could have called with a weak ace and made a small pair on the flop, then two pairs on the turn. If so, expect him to shovel a lot of chips into the pot.
But having made that raise preflop and having bet the flop, your opponent is probably going to be pretty wary of you unless he has a monster and many times you can take down the pot with nothing. The key is to size your bets in what some cricket journalists call “the corridor of uncertainty”. Your opponent should not know whether you are betting hoping that he will call and put more chips in the pot, or if you are betting in the hope that he will fold.
This is why it is good to be inconsistent in sizing bets. If you always bet half the pot when you have second pair and the full pot when you have top pair, you are not going to get callers for your bets unless they have a better hand than you.
One of the biggest fallacies over bets in RP is with the use of the shove or all-in on the flop or later streets. Does the shover want you to call, because he has the best hand, or is he terrified that you will call? Weak players will tend to shove when they have the nuts or a very strong hand and thus reduce their chance of being paid off by second best hand.
Very few players on RP will risk their whole stack with an all-in bluff on the river when they don’t have the goods. In the later stages of the 1-million chips tournaments, you may find a few who will do this if they think they know the opponent is cagey and might fold top pair suspecting a slow played set or something like that.