Great! the 12 bar is really good to experiment and learn with but you can still change it up a bit as I’ve shown below.
the first example is the very basic way of playing a 12 bar followed by some common variations people like to use, depending on the feel you want in your tune:
| I | I | I | I | IV | IV | I | I | V | V | I | I |
| I | I | I | I | IV | IV | I | I | V | IV | I | V |
| I | I | I | I | IV | IV | I | I | II | V | I | V |
| I | IV | I | I I(7)| IV | IV | I | I | V | IV | I | V |