lol, you mean searching beyond looking at the picture? that's like a $10 garage sale bike. which is perfect for an on-the-cheap conversion

anyways, to OP, you can do it up fixed. not trying to be mean though, but if that's you in the picture you'll probably want to get at least 36 spoke deep vs, and get them checked by a bike shop.

pedal strike could be a *****, don't know how long the cranks are and how low the bottom bracket is. might be easiest to just take off the freewheel that's on there, throw on a bmx freewheel and run it as a single speed (if you don't want to worry about keeping those cheap derailleurs in adjustment)