I hate to say this, but it is the wrong engine for a beginner. Those #$%$#@$^ will give an experienced modeller fits & will drive a newb to drink. Get something else.

There is a delicate balance between high-speed & low-speed needle settings that gives perfect tune.

Start by setting the high-speed needle to peak rpm then back off (richen) until you just hear a drop in rpm.

Go to idle & let it run at idle for at least a minute. If it slowly begins to stumble at idle then eventually dies, the low speed neeedle is too rich. If it just dies away fairly quickly at idle without the "stumbles", it is too lean. Adjust the low speed needle in 1/4 turn increments until it will stay running for at least a minute at idle.

When it will idle reasonably reliably, suddenly accelerate it to full throttle -- if it quits abruptly, the low speed is a bit too lean. If it sputters and stumbles & quits, or accelerates slowly, the low speed is too rich. adjust to suit.

When you have that set up correct, re-adjust the high speed needle for best operation, then repeat the low speed sequence.

With a "good" engine, this will fix everything. Unfortunately, you will probably fight the Tower lump forever.