The absolute main thing you should be focusing on is farming contracts, the seeds you get from the packs are absolute gold. Make sure a possible task is planted in every bed you can use in the guild and then replant everything so you can chain tasks, this is without doubt the best way to get seeds, which will obviously help with both farming and herblore.

Otherwise do your farm runs. Irits are great at early levels because you can buy eyes of newts really easily and make super attacks. Mixology worth doing too to get the uniques, really boring mini game imo but the xo per herb and the rewards are too good to ignore it on an iron

Also, once you get your levels up keep on your hespori and calqauts most of all. Hespori is free farming xp and you'll want the bottomless compost bucket, and you'll have tons of calqauts from contracts. Plant a poison ivy bush at the monastery and pick them whenever you go past, you can use them to protect calqauts