You're going to have fun. Make sure you use a "chicken stick" or some leather gloves for flip starting. Flip smartly, with intention and get your hand out of the prop. Use the recommended Thunderbolt #3, you can get them easily from many online hobby suppliers like Tower or Hobby People. Also a good fully charged glow starter will help with successful starts. Always disconnect when you're not actually starting to preserve the battery. Always good to have an extra plug for that unusual case where it might blow. Brand new engines are tight at TDC (top dead center) so expect its going to take a few flips. After a few runs it will start easier. Magnum engines come with a very complete manual
http://www.hobbypeople.net/media/upl...sers_Guide.pdf read it completely, re reread it, and refer back to it for any question that comes up. A DuBro 4 ounce tank is more than enough for your initial tests, mount it center in relation to the high speed needle.
Have fun, I love starting a model engine and sometimes is the highlight of any day.
AND KEEP YOUR FINGERS AND HAND OUT OF A SPINNING PROP!