Adult squad normally have 2 types - adults learning technique - and gradually building endurance and the top end of the training ladder.
1). happy to do 50 in 50-60 secs they might swim 2.5 kms mostly less a squad.
2). unhappy if a race 400 isn't under 35-40 secs - they follow what is on the swim board - they nearly always swim 5 kms a squad
Type 1) Good starting point & as mentioned = motivation - morning squad my way = 1.5 hours from 5:30.
The SLS bronze run/swim/run = 400m in 9 minutes. For a swimmer this is easy.
For a non-swimmer / un fit this is a push.
My goal was basic endurance so 20 laps in 20 minutes (1Km) then 40 in 40 but never pushed enough to achieved 60 in 60. As mentioned use any aids which help you, obviously goggles (rub a v.light smear shampoo on inside to stop fogging). Flippers - smaller the better - hand paddles load up your shoulders - and if you are bad at pacing URself

a snorkle - can use your standard one but central one is excellent.
Normally find a kickboard to use at pool - U either have it or U do not - I do not so always flipper up.
Bottom line - felt better after - suggest U set realistic goal(s) so swim for an hour with range of activities and try to improve number of laps - 5 kms for a non-swimmer (over 40-ish) is a great goal but realistically likely to take 3+ months visiting 4 times a week.
Once U have 10 laps under your togs U do not care what U R wearing..

Cheers
AP