Dogz
First flight with no engine could be worst, but now you have to fix it and fly again

your plane still tail heavy and when you flare it maintain its altitude thats mean you are little high over the ground then hit it hard because stalls

When you approach for a landing you have to come a little hot once over the threshold chopped the throttle and let the model glide to the runway then flare a few inches off the ground in all this process you have to control the altitude with throttle and speed with elevator

If you are getting short of the runway add power and coordinate with the elevator the rate of sink and if you are coming to fast go around donīt force the landing because this plane is going to bounce

I suggest you check the low speed performance do some stalls at high altitude before you landing this practice help to know when to flare
I hope this helps