Some questions about EP

You can activate a Normal Spell Card, such as "Raigeki", then chain "Emergency Provisions" and send "Raigeki" to the Graveyard to gain 1000 Life Points, and the effect of "Raigeki" will still resolve.

Does this also apply to normal(maybe other types too?) trap cards?

And

Do you choose how many M/Ts you send?

Yes you can chain Emergency Provisions to Normal traps (expically Good Goblin Housekeeping) as both Emergency Provisions and normal traps are Spell Speed 2. Sending them to the GY does not prevent them from resolving if they've already been activated. You cannot chain Emergency Provisions to counter traps which are Spell Speed 3. Also you can just send one or as many Set Spells/Traps on your side of the field for Emergency Provisions.

basically emergency provisions does not combo with the following for the following reasons:

a) counter traps - spell speed prevents chaining
b) any card that needs to be on the field to resolve such as continuous/equip/field cards and swords of revealing light - you can do it but you won't get the effect of these cards

basically any normal spell/trap, quickplay, or ritual card works wonderfully with it. just remember to activate ep last since the other cards are sent as its cost.