Delphi Beginner needs help with writing Query and managing results

I'm using something similar to the following code to enter an sql query and then place the results of a particular field somewhere on my form.

    Query1.SQL.Clear;
    Query1.SQL.Add ('Select * From tablename Where value = someData');
    Query1.RequestLive := true;
    Query1.Active := true;
    Query1.Open; {open query + display data}

    EditBox.Text := Query1.FieldByName('name').AsString;

I just started with Delphi a couple days ago and I need some help.  A lot needs to change with this and I have several questions.

1) Probably the easiest question is how do I check the number of records that is returned from my query?

2)Next, I need to check if the fieldname 'name' exists before I attempt to assign its value to my EditBox how do I do that?  Also is there anyway to pull out all of the fieldnames in a table?

3) Finally, I tried putting the above in a try statement but even with that if I entered bad data into the query (e.g. a non-existent tablename, or tried to check values with incompatible types) the program would give me an error and crash (maybe I was doing it wrong).  Is there anyway that I could have something less harsh happen if the program can't execute the query.