That's quite an ambitious first conversion. Not a bad subject, but it's quite a large plane, calling for a 1.20 4-stroke glow engine.

Personally, I would start out a bit smaller, with something a little more suited to an advanced-beginner/almost-intermediate pilot. The cost of converting something that big will probably make you choke when you see it, and if that doesn't make you choke, crashing something that expensive will

Look more in the range of planes that call for a .40 2-stroke glow engine for your first conversion. There are thousands of subjects and they run the gamut from simple trainers to advanced aerobatic/scale/propjet type aircraft. Heck, I think there are a few Tiger Moths out there in this size.

Conversions have gotten much easier as time has marched on. There's not quite as much science involved as there once was. Eflite, for example, has named their line of motors in terms of the appropriate glow engine "equivalents." If you use a Power46 motor with one of the recommended prop/battery combinations, you can expect reasonable performance out of most any glow airplane that usually calls for a .40-.46 2-stroke glow engine, for example.