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So, I am just starting to get into 30k, and I am trying to build an iron warriors / mechanicus list. A lot of my 40k army can be reused, but its still pretty daunting in terms of cash expenditure to get really into it.

I have: a cataphractii captain with combi melta and chainfist, legion praetors that I use as chaos lords, three quad mortar rapiers, two whirlwind scorpiuses, ten lascannon havocs in mkiii, five missile launcher havocs in mkiii, five heavy bolter in mkiii, ten tyrant siege terminators, ten cataphractii with power fists and combibolters, and about a million mkiii and mkiv tactical squads.

Especially in terms of mechanicus units, what else should I purchase? I was thinking the ironfire row with siegebreaker for iw? Any help would be appreciated.

TOS has a great video on this topic. https://www.youtube.com/watch?v=bfbRDK1pZt8
And Assuming you have the cash to work with. Medusas/Basilisks, and a Typhon Siege Tank... or 3 of them

Awesome. Thank you