Hallo,

I can do a 45 lbs bar plus 27.5 lbs on each side which is 100 lbs in total. Is this reasonable for a newbie? Some of the guys who have been in the gym for a year can do 155 lbs so I can start at a reasonable level.

How should I aim to progress?

100lbs isn't much, but it really depends on weight and age.

Wow, what did you start with? What can you do now?

what you start at really doesn't matter, you'll progress fast. Are you only benching? You should really get yourself a structured program that works your entire body with squats, deadlifts, rows, bench, pullups, military press, etc.

Your progression also depends greatly on how you eat. You can make a certain amount of gains just by nervous system adaptations, but after awhile, you simply have to eat more to put on more muscle to lift more.

I couldn't say really I just recently started doing incline benches since i created my own bench with 2 chairs and some pillows, and the maximum amount of weight i have is 115lbs, so i couldn't test my max

But I could do 115lb somewhat incline 30 times, and some 1rep max calculator said my max is around 240

I read somewhere to try and do the bench press before other workouts but this is not possible due to me going to the gym when there are many people. Is this the case?

You should be doing your biggest, most taxing compound lifts first. The ones that take the most energy should go before exercises like bicep curls, etc. I would do Bench as my third exercise, after Military Press and Chin ups, but thats just me.

What you lift is what you lift. What others lift is not what you lift.

True that is. Are there any rules of thumb like you should aim to bench x+y after how long or your weight/x ? I've heard of the max one rep but I don't wanna end up hurt trying to find my max one rep.

As long as you keep improving, thats all that matters.