I have bad experiences with formatting on this site, so I just use normal prose style. If it will help, let me try the above again:
A prepositional phrase can't be a subject, so
'lon sinpin mi'
gets read as a noun phrase,
"my forward location" or so.
To keep it as a "where" expression, it needs to go in one of three places:
1. before the sentence, as a Condition:
'lon sinpin mi la lipu mute li lon' or so (and the 'lon' could probably be dropped)
"In front of me here are many papers";
2. in the predicate as a Prepositional Phrase,
'lipu mute li lon, lon sinpin mi' -- which immediately collapses into 'lipu mute li lon sinpin mi'
"There are many papers in front of me";
3. as a modifier to the noun phrase,
'lipu mute pi lon sinpin mi li lon'
"Many papers in front of me exist" or so.
The middle choice seems the most natural.
Of course, "I have many papers in front of me" is literally
"mi jo e lipu mute, lon sinpin mi'
but the versions above seem equally good or even better.
[I see that, as usual, most of the formatting was lost. The marginal improvement (if any) in clarity hardly seems worth the extra effort.]