This post should solve your questions about where to find iron and other resources
How to travel to other planets or places. Warp conduits can be handcrafted and require almost nothing to be made, you can also go to sancturn and use the warp that’s not open to travel to your saved locations.
But if you want to save yourself some coin and travel to other planets, you can use portals. Head to Berlyn Township [-1704, 100, -139]
Before it was harder to find gold, too hard. There’s been a recent redistribution and some people are finding it harder to find certain needed resources at the start of a game, especially in Solum. With due time it will be fixed.
Helpful resources
Crafting recipes and more, made by the legend @Stretchious
http://boundlesscrafting.com/
Discord channel, where you’ll find more helpful people to answer your doubts.
Discord