1 limper. Bet 1/3-1/2 the pot. You're most likely best right now, but the pot is small, and you want weaker hands like 88, 66, Axs, etc to call with just under the correct odds so you can give them a tough choice on the turn.

2-3 limpers. Bet 2/3 pot to the full pot. You need to be serious here, protecting your equity and folding to a raise.

4+ limpers (very loose game). Check/raise to protect your hand.