lots of questions from a rail novice

[Jac]

Its years since I've used trains on the Sligo-Dublin line so please forgive all the questions.

I'm disabled and although not in a chair I'm not the most mobile so I was thinking of reserving a seat from Longford, it'd either be 10.17am or 12.16pm I'd be using.

I have a travel pass but I'm not sure how this would work with reserving a seat?

And when I reserve a seat do I just get a seat number and would there be much walking involved?

Also what would the space on the particular trains on these schedules be like? I remember leg room used to leave a bit to be desired.

I assume its all layed out like they used to be, as in two seats facing two more or is there any single seats at all?

Sorry for all the questions but I want to be sure what I'd be facing in to.

Thanks for any help.