start of light then get heavier and you won't feel so sore.

Never push yourself too hard. Stressing your muscles may be worse than not working out at all. Let them rest, just eat healthy.

it always hurts at the gym on the weights just done overdo yourself stick to a 5day weight routine including
Day 1 - Biceps/Arms
Day 2 - Legs + Stomach ( this gives a days rest for the arms )
Day 3 - Chest
Day 4 - Shoulders
Day 5 - Back

remember theres no point in training weights unless you eat right thats the most important

It's fine to carry on lifting while they're sore. It's just because its a shock you aren't used to

go on a three day rotation, back and bi ceps, chest and tris, and legs shoulders. do that rotation twice a week and take sunday off. That gives you plenty of time to let each muscle group recover