upgrade my dell laptop to SSD (Inspiron 5558)

hey guys,

i'm new here and hope it's the right place to ask

i bought my laptop 2 years ago with 2TB 5400 rpm (slow for today times good for 2 years ago)

now i decide it's may the time to upgrade to SSD - for i think the pc fine but i want him a little faster.

what i need from you?

1. i need to know what the SSD size i need (inch and height) and what the maximum size i can buy (i think about  750/512GB)

2. what the brand of ssd is good for this laptop?

3. now i have 16GB ram ddr 3 1600 mhz (8GBX2) it's the max too?

4. the pc sometime is to noisy and to hot from the hole on the side, its fine?

hope you will can help me.

thanks 

tom

Israel