Generally sleeps 6-5ish
Is that 6pm to 5am? With no wake ups I assume. Are you happy with a 5am wake up? Becayse 11h night sleep is about right for this age, so a 6pm bedtime is going to give you a 5pm wake up.
Yes, there might be some flexibility in that - 4am-7am would all be quite reasonable for a 6pm bedtime. If you shifted to an 8pm bedtime, then your average wake up should be around 7am, with a range from 6am-8am all being nothing to be concerned about.
At the moment while you have no to-the-clock routines is the time to establish that change, if you intend to.
Onto your actual question about starting yo set more older baby routines - that begins with wake up time. Hence having a regular, set wake up time. I would start off with 11h after bedtime.
If you want a 6pm bedtime then 5am will be your get-up time. So any wake up before 4.30 I would consider night and resettle or ignore if not distressed. Then any wake up 4.30-5am baby is allowed a norning snuggle in your bed. 5am you get up. If baby isnt awake, you wake him.
Or make bedtime 8pm. Morning cuddles from 6.30am. Get up 7am and wake baby at 7am if not awake.
That them gives you a consistant start to the day. Then with your 2h awake time it automatically routines the first nap as 9am.
I would keep 2h awake times while naps are short. So it might be naps at 9-9.30am, 11.30-12pm, 2-2.30pm, 4.30-5pm and 8pm bedtime.
Or it might be naps at 9-10am, 12.30-1.30pm, 3.30-4.30pm and 8pm bedtime.
Then as as naps extend to more like 90m-2h, you might have 9am - 10.30/11am and 2pm - 3.30/4pm. But the consistant factor in all of this is bedtime and get up times of 8pm and 7am.