New here - question about sizing for new setups

Hey everyone, been lurking for a bit, figured I'd finally post. I'm relatively new to active trading beyond just long-term holds and currently trying to build out a more systematic approach. One thing I'm wrestling with is initial position sizing when I'm testing a new setup or strategy. I'm clear on standard risk-per-trade for established strategies, but for something I'm still gathering data on, do you scale down your initial size dramatically, or do you have a specific percentage you allocate for 'experimental' trades?