The main strategy is to get Chaos Golem out as soon as possible (I recommend to go as second, so you can attack at first) and as often as possible.
Once he is out, just blast of the opponents field with his brute force, spell/trap (and in BP monster effect) immunity and multi-attacks.
Another helper is reactor dragon which can block spell/traps during battle phase and can clear the opponents back row after attacking. Tribute sommuning him with Geartown and Ancient Gear Gadget grants you a cheap and strong monster.
A good kickstarter for the first turn is Catapult and Geartown to search out Wyvern / Dog / Dragon and fuse Giant.
Future Fusion can be used to get a Chaos Giant, then banish the sent materials with overload fusion and get two Giants (one immediately, one in the next turn) with that combo.
Howitzer is used for different situations, because he could either search Wyvern (further searching), Dog (fusion summon) or Dragon (Attacker/Defender)
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