Yes, anything your main character deposits in the bank can be picked up by your alts and either researched or deconned.
Once your character reaches level 50 in crafts and you have a lot of traits learned, you can start getting master writs sometimes if you turn in daily crafting writs. Those require crafting with certain styles and traits and give you vouchers when turned in. That’s where the fun begins, especially if you are interested in housing. Then you can buy special housing furnishing plans.
The reason for having alts at that point is to have all of them doing daily crafting writs and getting master writs, so you have more of them.
Even if you aren’t into housing, you can do research on all of your characters at the same time, and if you invest skill points into the crafting skill you are also able to research more than one trait at a time.
Hope this helps.
Congrats on the first house! Take your time and make it your own.
TL:DR: Prioritize Main but don't forget to give the alts some love. Maxed craft = more money/daily. More max toons = more more money. More toons know = more master writs. More master writs = more xp, money, furnitures, etc.
If you're researching all the traits on several toons, consider starting at the bottom of the trait list on some of the alts and working to the top of the list at the same time you're working your way down on the first group.
That way you don't need the same traits for research at the same time on all your alts, plus, when you get half way through - the two groups of alts can easily craft for each other's research. The last part can be important in that they can research for each other rather than relying on guildmates or luck to keep your research progressing. You only need one set of everything to make you self sufficient.
The sooner you can be doing everything simultaneously on all toons - the sooner you get done watching a timer/calendar.