Since you can't rely on other players for supplies, you'll need to gather everything yourself. Building a sustainable cycle of RuneScape gold gathering and crafting resources is key.
Critical Gathering Skills:

Woodcutting + Firemaking: Chop trees and burn logs. This combo trains two skills at once and helps unlock winter event activities and Quest requirements.

Fishing + Cooking: Your best early source of food. Start with shrimp and anchovies, progressing to trout, salmon, and eventually lobsters.

Mining + Smithing: Essential for making your own gear. Start with copper and tin, move to iron, then aim for steel and mithril for more reliable combat gear.

Crafting: Kill cows for hides, tan them into leather, and craft armor. This saves money and provides a good armor set early on.

Herblore: Use herbs and secondaries from early Slayer and farming to make basic potions. Even simple Strength or Energy potions are huge early-game boosts.

The earlier you start building this resource infrastructure, the less painful the progression becomes in the mid-to-late game.

Efficient Combat Training

Training combat is crucial for survival and unlocking better gear. Ironmen don't have the luxury of buying weapons or armor from other players, so you'll need to earn everything through grinding and loot.

Best Early Training Spots:

Chickens & Cows – Easy to kill, drop feathers, hides, and bones.

Goblins – Good for early gear drops and quick XP.

Al Kharid Warriors – Moderate defense and decent XP for mid-level combat.

Stronghold of Security – A must-do for any Ironman. It offers 10,000 coins and four safe zones to train on increasingly tough monsters.

Be sure to pick up every bone you come across. Bury them or save them for use on a Gilded Altar later to cheap OSRS GP power-level your Prayer—a vital skill for combat survivability.